1. difficult to believe; not seeming reasonable or probable

Examples

• His excuse for being late seemed completely implausible.
• The witness gave an implausible account of the events.
• It’s implausible that she could have traveled that distance in such a short time.
• The movie’s plot was so implausible that it was hard to enjoy.
• The defendant’s alibi struck the jury as implausible.
• Her claim of never having seen the document before was implausible given the evidence.