/ Dictionary / Index U untruthful: Meaning and Definition of Find definitions for: un•truth•ful Pronunciation: (un-trth'ful), [key] — adj. not truthful; wanting in veracity; diverging from or contrary to the truth; not corresponding with fact or reality. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: untruthful (Thesaurus) untruth untuck Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language