Words That Start With U (With Definitions)

The letter ‘U’ is the initial letter of many words in the English language. They range from short and common words, to longer, more specialized terms.

 

3 Letter Words That Start With U

• Udo: An Asian plant of the parsley family.
• Ugh: An expression of disgust or horror.
• Uhf: Ultra High Frequency, a range of radio frequencies.
• Uke: Short for ukulele, a small stringed musical instrument.
• Ule: A type of rubber derived from a tropical American tree.
• Ulu: An Inuit woman’s knife with a crescent-shaped blade.
• Urn: A type of vase, typically used to hold ashes of the deceased.
• Use: To employ for a specific purpose.

4 Letter Words That Start With U

• Uber: Beyond; super. Also refers to the ride-sharing company.
• Udon: A type of thick wheat noodle popular in Japanese cuisine.
• Udos: Plural of udo, an Asian plant of the parsley family.
• Ughs: Plural form of “ugh”, an expression of disgust or horror.
• Ugly: Unpleasant to look at; not attractive.
• Ukes: Plural form of uke, short for ukulele.
• Ulva: A type of green seaweed.
• Unit: A single thing or person.

5 Letter Words That Start With U

• Udder: The mammary gland of female cattle or other mammals.
• Uhlan: A lancer in a European light cavalry unit.
• Uhuru: Swahili for “freedom”; also refers to Kenyan independence from British rule.
• Ukase: An edict or order from a Russian government authority.
• Ulama: Muslim scholars who are recognized as having specialist knowledge of Islamic sacred law and theology.
• Ultra: Beyond; excessive.
• Usual: Commonly encountered, typical.

6 Letter Words That Start With U

• Uakari: A type of New World monkey with a bald face and long hair elsewhere.
• Ubiety: The condition of being in a specific place.
• Ubique: Everywhere; omnipresent.
• Udders: Plural of udder.
• Uglier: Comparative form of the adjective “ugly.”
• Uglify: To make ugly.
• Uglily: In an ugly manner.
• Ugsome: Loathsome or horrid.
• Uhlans: Plural of Uhlan.
• Ukases: Plural of Ukase.
• Ulcers: Open sores on the body.
• Ullage: The space not filled with liquid in a container, especially a wine bottle.
• Ulster: A type of long, loose overcoat.
• Ultima: The last syllable of a word.
• Ultimo: In the last month.
• Ultras: Extreme supporters, especially in sports.
• Umbels: Plural of Umbel; a flower cluster.
• Umbers: Natural pigments.
• Umbles: The edible entrails of an animal, especially those of a deer.
• Umbrae: Plural of Umbra; the fully shaded inner region of a shadow.
• Umbral: Pertaining to the umbra.
• Umlaut: The two dots placed over a vowel in some German words.
• Ummahs: Plural of Ummah; the whole Muslim community.
• Umphed: To express doubt or hesitation.
• Umping: The act of serving as an umpire.
• Umpire: A person who has the authority to make judgments or determinations.
• Umrahs: Plural of Umrah; a pilgrimage to Mecca, smaller than the Hajj.
• Umteen: An indefinitely large number.
• Unable: Not able to do something.
• Unaged: Not aged; young.
• Unarms: Disarms or removes weapons.
• Unavid: Not avid; lacking enthusiasm or eagerness.
• Unawed: Not awed; not filled with wonder, fear, or reverence.
• Unbait: To remove bait from.
• Unbars: Opens by removing a bar or barrier.
• Unbelt: To remove a belt from oneself or another.
• Unbend: To straighten out from a bent position.
• Unbent: Not bent; straight.
• Unbind: To release from bindings or restraints.
• Unbled: Not bled; not having blood drawn.

7 Letter Words That Start With U

• Ufology: The study of unidentified flying objects (UFOs).
• Ugliest: Superlative form of the adjective “ugly.”
• Ukelele: An alternative spelling for “ukulele”, a musical instrument.
• Ukulele: A small four-stringed guitar of Hawaiian origin.
• Ulexite: A mineral often referred to as “TV rock” because of its unique optical properties.
• Ullaged: Pertaining to ullage; having some empty space.
• Ullages: Plural of Ullage.
• Ulpanim: Hebrew language schools in Israel.
• Ultimas: Plural of Ultima; the last syllable of a word.
• Ultisol: A type of soil typical of warmer regions that often has a subsoil rich in clay.
• Ululant: Wailing; mournful.
• Ululate: To howl or wail loudly.
• Umbered: Covered or tinged with umber, a natural brown pigment.
• Umbonal: Pertaining to the umbone, the pointed, central part of a shell.
• Umbones: Plural of umbone.
• Umbonic: Of or relating to the umbone.
• Umbrage: Offense or annoyance.
• Umlauts: Plural of Umlaut; the two dots over a vowel.
• Umphing: The action or sound of expressing doubt or hesitation.
• Umpired: Acted as an umpire.
• Umpires: Plural of Umpire; individuals who judge sports games.
• Umpteen: Indefinitely many; a lot.
• Unacted: Not acted upon.
• Unadded: Not added.
• Unadult: Not adult; immature.
• Unagile: Not agile; clumsy.
• Unaided: Without any help or assistance.
• Unaimed: Not aimed.
• Unaired: Not broadcasted or ventilated.
• Unalike: Not alike; different.
• Unaptly: In an unsuitable manner.
• Unarmed: Without weapons.
• Unasked: Not asked or inquired.
• Unawake: Not awake.
• Unaware: Having no knowledge of a situation or fact.
• Unbaits: Removes bait from.
• Unbaked: Not baked.
• Unbased: Lacking a foundation or basis.

8 Letter Words That Start With U

• Ubieties: The quality of being everywhere at the same time; omnipresence.
• Ubiquity: The state of being everywhere or widespread.
• Uglified: Made ugly.
• Uglifies: Makes ugly.
• Ugliness: The state or quality of being ugly.
• Uintaite: A mineral pitch found in the Uinta Valley, Utah.
• Ukeleles: Plural of ukelele, a variant spelling of ukulele.
• Ukuleles: Plural of ukulele, a small musical instrument.
• Ulcerate: To form an ulcer; to become ulcerous.
• Ulcerous: Affected with, or as if with, an ulcer or ulcers; ulcerative.
• Ulexites: Plural of ulexite, a mineral.
• Ulterior: Hidden or beyond what is obvious.
• Ultimacy: The state or quality of being ultimate or final.
• Ultimata: Plural of ultimatum, a final demand or proposition.
• Ultimate: Last in a progression or series; final.
• Ultisols: Soils found primarily in humid temperate or tropical regions.
• Ultradry: Extremely dry.
• Ultrahot: Extremely hot.
• Ultraism: Extreme views or actions.
• Ultraist: One who holds extreme views.
• Ultranet: Ultra-fine net or network.
• Ultrared: Beyond the red part of the spectrum; infrared.
• Ululated: Made a howling or wailing noise.
• Ululates: Howls or wails.
• Umbellar: Of or relating to an umbel, a type of inflorescence.
• Umbellet: A secondary umbel in a compound umbel.
• Umbering: Coloring with or as with umber.
• Umbilici: Plural of umbilicus; navels.
• Umbonate: Having a raised area resembling a button.
• Umbrages: Plural of umbrage, offense or annoyance.
• Umbrella: A device for protection against rain or sun.
• Umbrette: A shade for a lamp or light.
• Umeboshi: Japanese pickled ume fruits.
• Umlauted: Having an umlaut or modified sound.
• Umpirage: The office, function, or jurisdiction of an umpire.
• Umpiring: Acting as an umpire; refereeing.
• Umteenth: Indefinitely numerous; very many.
• Unabased: Not abased; not lowered in rank, status, or esteem.
• Unabated: Continuing at full strength or intensity.
• Unabject: Not abject; not degraded or lowly.
• Unabused: Not misused or mistreated.
• Unaching: Not aching; free from pain.

9 Letter Words That Start With U

• Ubiquitin: A small protein that tags proteins to be degraded in the cell.
• Ufologies: Plural of ufology; the study of unidentified flying objects.
• Ufologist: Someone who studies unidentified flying objects.
• Uglifying: Present participle of uglify; making something look unattractive or unpleasant.
• Uintahite: Another term for uintaite, a mineral pitch.
• Uintaites: Plural of uintaite.
• Uitlander: A foreigner, especially a British resident in the former republics of the Transvaal and Orange Free State in South Africa.
• Uitwaaien: A Dutch term meaning to walk in the wind.
• Ulcerated: Affected with an ulcer or ulcers.
• Ulcerates: Third person singular of ulcerate; to develop ulcers.
• Uliginose: Swampy; marshy.
• Uliginous: Marshy; relating to marshes.
• Ultimates: Plural of ultimate.
• Ultimatum: A final statement of terms made by one party to another.
• Ultrachic: Extremely chic or stylish.
• Ultracool: Extremely cool or fashionable.
• Ultradian: Referring to recurrent periods or cycles that are less than 24 hours.
• Ultrafast: Faster than is usual or expected.
• Ultrahigh: Extremely high.
• Ultraisms: Plural of ultraism; extreme views or measures.
• Ultraists: Plural of ultraist; one who holds or supports extreme views or measures.
• Ultraleft: Far-left politically; or extreme left-wing.
• Ultranets: Plural of ultranet.
• Ultrapure: Extremely pure.
• Ultrarich: Extremely rich or wealthy.
• Ultrasafe: Extremely safe.
• Ultraslow: Very slow.
• Ultrasoft: Extremely soft.
• Ultrathin: Extremely thin.
• Ultrawide: Much wider than the average or usual.
• Ululating: Making a howling or wailing sound.
• Ululation: A howling or wailing sound.
• Umbellate: Bearing or arranged in umbels.
• Umbellets: Plural of umbellet; smaller umbel in a compound umbel.
• Umbellule: A secondary or small umbel in compound umbels.
• Umbilical: Related to the navel or the umbilical cord.
• Umbilicus: The navel; the center or middle of something.
• Umbrellas: Plural of umbrella.
• Umbrettes: Plural of umbrette.
• Umlauting: Present participle of umlaut; modifying a vowel sound.
• Umpirages: Plural of umpirage; the role or jurisdiction of an umpire.
• Unabashed: Not embarrassed or ashamed.
• Unaltered: Not changed or modified.
• Unamended: Not modified or revised.
• Unanimous: In complete agreement.
• Unappeased: Not satisfied or pacified.
• Unassuming: Modest, without pretensions.
• Unattached: Not connected or affiliated.
• Unattended: Not watched over or supervised.
• Unavenged: Not avenged or retaliated for.
• Unawakened: Not aroused or activated.
• Unbalanced: Not in equilibrium; or mentally unstable.
• Unbearable: Impossible to endure or tolerate.
• Unbeatable: Impossible to defeat.
• Unbeknown: Without the knowledge of someone.
• Unbeliever: A person who does not believe, especially in religious matters.
• Unbendable: Not capable of being bent.
• Unbeatable: Cannot be overcome or surpassed.
• Unblinking: Not blinking; or showing no sign of shock or surprise.
• Unblockade: To remove a blockade from.
• Unborrowed: Not borrowed or taken from another source.
• Unbranched: Not having branches.
• Unbridled: Lacking restraint or control.
• Unbruised: Not harmed or hurt.
• Unbuckling: Undoing or opening a buckle.
• Uncannily: In a way that’s strange or mysterious.
• Unceasing: Never stopping; continuous.
• Uncensored: Not having any part removed or suppressed.
• Unchanged: Remaining the same.
• Uncharted: Not mapped or surveyed.
• Unchecked: Not examined or inspected.

10 Letter Words That Start With U

• Ubiquitary: Being everywhere at once; omnipresent.
• Ubiquities: Plural of ubiquity.
• Ubiquitins: Plural of ubiquitin.
• Ubiquitous: Present, appearing, or found everywhere.
• Ufological: Relating to ufology, the study of unidentified flying objects.
• Ufologists: Plural of ufologist.
• Uglinesses: Plural of ugliness.
• Ugsomeness: The state or quality of being ugsome or loathsome.
• Uintahites: Plural of uintahite.
• Uintathere: A large prehistoric mammal of the Eocene epoch.
• Uitlanders: Plural of uitlander.
• Uitwaaiens: Plural of uitwaaien.
• Ulcerating: Present participle of ulcerate; developing ulcers.
• Ulceration: A sore on the skin or mucous membrane.
• Ulcerative: Causing, characterized by, or affected with ulcers.
• Ulcerously: In an ulcerous manner.
• Ulteriorly: In a manner that is intentionally hidden or not obvious.
• Ultimacies: Plural of ultimacy.
• Ultimately: In the end; finally.
• Ultimatums: Plural of ultimatum.
• Ultrabasic: Referring to igneous rocks that have a very low silica content.
• Ultraclean: Extremely clean.
• Ultrafiche: A microfiche of very high resolution.
• Ultraheavy: Extremely heavy.
• Ultrahuman: Beyond human; superhuman.
• Ultraistic: Extremely altruistic.
• Ultralarge: Very large in size.
• Ultralight: Extremely light.
• Ultramafic: Referring to igneous rocks with very low silica and high magnesium and iron content.
• Ultrarapid: Extremely rapid or fast.
• Ultraright: Extremely right-wing or conservative.
• Ultrasharp: Extremely sharp.
• Ultrashort: Extremely short.
• Ultrasmall: Very small in size.
• Ultrasmart: Extremely smart or intelligent.
• Ultrasonic: Relating to sound waves with a frequency above the range audible to the human ear.
• Ultrasound: Sound or other vibrations having an ultrasonic frequency, particularly as used in medical imaging.
• Ululations: Plural of ululation.
• Umbellules: Plural of umbellule.
• Umbilicals: Plural of umbilical.
• Umbilicate: Resembling or related to the navel; depressed in the center, like a navel.
• Unabatedly: Without any reduction in intensity or strength.
• Unadjusted: Not altered to fit particular needs or circumstances.
• Unadulterd: Not mixed or diluted with any different or extra elements.
• Unaffected: Not influenced or changed by something; also can refer to sincere demeanor.
• Unambiguous: Clear and without uncertainty.
• Unanimously: In complete agreement.
• Unannounced: Without any prior notice or warning.
• Unanswered: Not responded to.
• Unappeased: Not brought to a state of peace or contentment.
• Unapproved: Not having been confirmed or accepted.
• Unarguable: Impossible to dispute or doubt.
• Unassisted: Without help or intervention.
• Unattached: Not joined or linked to anything else.
• Unattended: Not taken care of or looked after.
• Unattractive: Not pleasant to look at; not appealing.
• Unauthentic: Not genuine or real.
• Unavailable: Not able to be used or obtained.
• Unavoidable: Impossible to prevent or avoid.
• Unbalanced: Not in proportional arrangement, mentally unstable or not fair.
• Unbelievers: Those who reject belief, especially in the major tenets of a religion.
• Unbelieving: Not believing; skeptical.
• Unbleached: Not whitened by chemical, physical, or natural agents.
• Unblemished: Not damaged or marked in any way; perfect.
• Unbreakable: Impossible to break, especially under normal conditions.
• Unbridled: Uncontrolled or unrestricted.
• Unburdened: Relieved of something that oppresses or worries.
• Unbuttoned: Not fastened with buttons; also can refer to a relaxed manner.
• Uncertainty: The state of being unsure or not knowing.
• Unchallenged: Not questioned or disputed.
• Unchanging: Remaining the same.

11 Letter Words That Start With U

• Ulcerations: The process or condition of becoming ulcerated, often referring to open sores on an organ or tissue.
• Ulcerogenic: Capable of causing or producing ulcers.
• Ulotrichous: Having woolly or crisply curly hair.
• Ultracasual: Extremely casual; beyond the normal level of informality.
• Ultrafilter: A filter designed to remove very fine particles or contaminants from liquids or gases.
• Ultralights: Very light and small aircraft that carry one or two people.
• Ultramarine: A deep blue pigment originally made by grinding lapis lazuli into powder.
• Ultramodern: Extremely modern and advanced in ideas or methods.
• Ultrasimple: Extremely simple; lacking complexity.
• Ultrasonics: The study and application of sound waves beyond human hearing range.
• Ultrasounds: Sound waves with a frequency higher than the upper limit of human hearing, often used in medical imaging.
• Ultraviolet: Electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays.
• Ultravirile: Extremely masculine or virile.
• Umbellately: In a manner resembling or related to an umbel, a type of inflorescence.
• Umbellulate: Having small or secondary umbels.
• Umbilically: In relation to or resembling an umbilicus or navel.
• Umbilicated: Having a navel or depression like a navel.
• Umbriferous: Giving or casting shade.
• Unabandoned: Not abandoned; still maintained or kept.
• Unabashedly: Without embarrassment or shame.
• Unabatingly: In a manner that does not lessen or subside.
• Unabolished: Not abolished or done away with.
• Unabrogated: Not annulled or repealed.
• Unabsorbent: Not able to absorb or soak up moisture.
• Unabsorbing: Not engrossing or taking one’s attention.
• Unabusively: In a manner that is not abusive.
• Unacclaimed: Not acknowledged or praised.
• Unaccounted: Not explained or accounted for.
• Unaccusable: Impossible to accuse or blame.
• Unaccustomed: Not familiar or usual; out of the ordinary.
• Unachievable: Impossible to achieve.
• Unacquainted: Not familiar with someone or something.
• Unaffiliated: Not officially attached or connected to an organization.
• Unaffordable: Too expensive to be afforded or bought.
• Unalienable: Impossible to take away or give up.
• Unallocated: Not distributed or given out.
• Unalterable: Not able to be changed.
• Unambiguous: Clear without any uncertainty.
• Unanimities: The state of being unanimous.
• Unannounced: Without any prior notice or warning.
• Unanswerable: Impossible to answer.
• Unapologetic: Not sorry or ashamed.
• Unappetizing: Not appealing or inviting to eat.
• Unarguable: Impossible to dispute or doubt.
• Unassailable: Unable to be attacked, questioned, or defeated.
• Unassertive: Not confident or forceful.
• Unassigned: Not given a particular job or role.
• Unassociated: Not connected; standing alone.
• Unattainable: Impossible to achieve.
• Unattractive: Not pleasant to look at.
• Unauthorized: Not having official permission or approval.
• Unbelievable: Impossible to believe.
• Unbelieving: Not believing; skeptical.
• Unblemished: Not damaged or marked in any way.
• Unbreakable: Impossible to break

12 Letter Words That Start With U

• Ubiquitously: In a manner that is present everywhere.
• Uglification: The process of making something ugly.
• Ulcerousness: The state or quality of having or resembling ulcers.
• Ultimateness: The quality of being ultimate or final.
• Ultracareful: Extremely careful or cautious.
• Ultrafilters: Filters that remove very small particles from a substance.
• Ultraleftism: Extreme left-wing political beliefs or principles.
• Ultraliberal: Extremely liberal in political or social beliefs.
• Ultramarines: Bright blue pigments made from powdered lapis lazuli.
• Ultramontane: Referring to the pope’s authority or the region beyond the mountains, typically the Alps.
• Ultramundane: Beyond the known world or universe.
• Ultraprecise: Extremely precise or accurate.
• Ultraradical: Extremely radical in beliefs or actions.
• Ultrarefined: Refined to an extreme degree or purity.
• Ultraviolent: Extremely violent.
• Ultraviolets: Refers to ultraviolet radiation, a type of electromagnetic radiation.
• Umbilication: A small depression or navel-like scar.
• Umbrageously: In a manner that causes offense or resentment.
• Umbrellabird: A bird, native to Central and South America, known for its umbrella-like crest.
• Umbrellalike: Resembling an umbrella.
• Unabandoning: Not giving up or abandoning.
• Unabsorbable: Not able to be absorbed.
• Unabstracted: Not abstracted or removed.
• Unacademical: Not related to or characteristic of academia or scholarly pursuits.
• Unacceptable: Not satisfactory or allowable.

13 Letter Words That Start With U

• Uglifications: Processes or acts of making something ugly.
• Ultracasually: In an extremely casual manner.
• Ultracautious: Being extremely cautious or careful.
• Ultracritical: Extremely critical or judgmental.
• Ultrafamiliar: Excessively familiar, to the point of being inappropriate.
• Ultrafeminine: Extremely feminine.
• Ultrafiltered: Having been passed through an ultrafilter, which removes very small particles.
• Ultrafiltrate: The liquid or solution that has passed through an ultrafilter.
• Ultraleftisms: The doctrines or practices of extreme left-wing ideologies.
• Ultraleftists: Individuals who advocate or belong to extreme left-wing ideologies.
• Ultraliberals: Extremely liberal individuals.
• Ultramarathon: A running race longer than the traditional marathon length of 26.2 miles.
• Ultramilitant: Extremely militant or combative.
• Ultramontanes: Supporters of the authority of the Pope over national churches or people living in a region beyond mountains.
• Ultranational: Relating to extreme nationalism.
• Ultraorthodox: Strictly adhering to traditional teachings, especially in religion.
• Ultrapowerful: Extremely powerful.
• Ultraradicals: Extremely radical people or ideas.
• Ultrararefied: Extremely or excessively refined.
• Ultrarational: Beyond or surpassing what is rational.
• Ultrarealisms: Art forms or beliefs that go beyond usual realism.
• Ultrarealists: Advocates or practitioners of ultrarealism.
• Ultrareliable: Extremely reliable or dependable.
• Ultrarightism: The doctrines or practices of extreme right-wing ideologies.
• Ultraromantic: Excessively romantic.
• Ultraroyalist: An extreme supporter of a monarch or monarchical principles.
• Ultratropical: Beyond or exceeding what is tropical.
• Ultravirility: Excessive virility or manliness.
• Umbelliferous: Bearing flowers in an umbel; relating to plants with such flower structures.
• Umbilications: Depressions or navel-like formations.
• Umbrellabirds: Birds native to Central and South America, known for their umbrella-like crests.
• Umbriferously: In a manner that produces or is associated with shade or shadow.
• Unabbreviated: Not shortened or contracted.
• Unaccelerated: Not quickened or made faster.

14 Letter Words That Start With U