/ Dictionary / Index T thief: Meaning and Definition of Find definitions for: thief Pronunciation: (thēf), [key] — pl. thieves. a person who steals, esp. secretly or without open force; one guilty of theft or larceny. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thief (Thesaurus) thick-witted thief ant Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language