/ Dictionary / Index F faithless: Meaning and Definition of Find definitions for: faith•less Pronunciation: (fāth'lis), [key] — adj. not adhering to allegiance, promises, vows, or duty: the faithless behavior of Benedict Arnold. not trustworthy; unreliable. without trust or belief. being without religious faith. (among Christians) bereft of Christian faith. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: faithless (Thesaurus) faith healing faitour Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language