Cool Words That Start With O (With Definitions)

These cool words all start with the letter O.

They might be considered cool because of their meaning, or because of the way they sound. From oscillate, to oblivion and oasis to outfox, there is something a little different in this list of fun words.

cool words that start with O

Cool Words That Start With O

Oaf: a clumsy or stupid person.

Oafish: clumsy, stupid, or boorish in behavior or manner.

Oasis: a fertile spot in a desert where water can be found.

Obdurate: stubbornly refusing to change one’s opinion or course of action.

Obfuscate: to make something unclear or difficult to understand.

Objectivity: the quality of being unbiased and impartial.

Oblation: a religious offering or sacrifice.

Oblivion: the state of being completely forgotten or unknown.

Obscure: not discovered or known about; uncertain.

Obsequious: overly eager to please or obey.

Obsidian: a dark, glass-like volcanic rock.

Obsolescence: the process of becoming obsolete or outdated.

Obstreperous: noisy and difficult to control.

Obtund: to dull or blunt the sensitivity or intensity of something.

Obtuse: lacking sharpness or quickness of sensibility or intellect.

Occult: relating to magic, supernatural phenomena, or esoteric knowledge.

Octogenarian: a person who is between 80 and 89 years old.

Odious: extremely unpleasant or repulsive.

Odyssey: a long and eventful or adventurous journey.

Offbeat: unconventional, unusual, or eccentric.

Officious: excessively eager to offer unwanted help or advice.

Ogle: to stare at someone in a lecherous or desirous manner.

Omnipotent: having unlimited power and authority.

Omnipresent: present everywhere at the same time.

Omniscient: having complete or unlimited knowledge, awareness, or understanding.

Onerous: involving a great deal of effort or difficulty.

Oodles: a large quantity or amount of something.

Opaque: not able to be seen through; not transparent.

Operose: involving a great deal of effort or difficulty.

Opprobrium: harsh criticism or censure.

Opulent: wealthy, rich, or luxurious.

Oracle: a person or thing regarded as a source of wise counsel or prophetic predictions.

Orange: a round fruit and the name of a color. It’s mainly cool because no other word rhymes with it 😊

Ordinal: relating to the order of things or numbers.

Ornate: highly decorated or embellished.

Oscillate: to move back and forth in a regular rhythm or pattern.

Ostensible: appearing or stated to be true, but not necessarily so.

Ostentatious: characterized by a vulgar or pretentious display; designed to impress or attract notice.

Ostracize: to exclude or banish someone from a group or society.

Outfox: to defeat or outwit someone by being more cunning or clever than they are.

Outlandish: bizarre, peculiar, or unconventional.

Outstanding: distinguished from others in excellence or achievement; very good or impressive.

Ovation: enthusiastic applause or cheering.

Overcast: covered with clouds or darkness; lacking in brightness.

Overhaul: to completely renovate or revamp something.

Oxymoron: a figure of speech in which apparently contradictory terms appear in conjunction.




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