/ Dictionary / Index I implausible: Meaning and Definition of Find definitions for: im•plau•si•ble Pronunciation: (im-plô'zu-bul), [key] — adj. not plausible; not having the appearance of truth or credibility: an implausible alibi. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: implausible (Thesaurus) implantology implead Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language