/ Dictionary / Index O obnoxious: Meaning and Definition of Find definitions for: ob•nox•ious Pronunciation: (ub-nok'shus), [key] — adj. highly objectionable or offensive; odious: obnoxious behavior. annoying or objectionable due to being a showoff or attracting undue attention to oneself: an obnoxious little brat. exposed or liable to harm, evil, or anything objectionable. liable to punishment or censure; reprehensible. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: obnoxious (Thesaurus) obnounce obnubilate Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language