/ Dictionary / Index T treacherous: Meaning and Definition of Find definitions for: treach•er•ous Pronunciation: (trech'ur-us), [key] — adj. characterized by faithlessness or readiness to betray trust; traitorous. deceptive, untrustworthy, or unreliable. unstable or insecure, as footing. dangerous; hazardous: a treacherous climb. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: treacherous (Thesaurus) trazodone treachery Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language