1. in a way that is difficult to believe or accept as true; not credibly

Examples

• The witness’s story was implausibly detailed for someone who claimed to have seen the event only briefly.
• The movie’s plot became implausibly complicated in the final act.
• She was implausibly young to be running such a large corporation.
• The defendant’s alibi seemed implausibly convenient.
• The hero implausibly survived the explosion without a scratch.
• His excuse for being late was implausibly elaborate.