implausible

this is a blatantly implausible claim.

an entirely implausible out-turn.

a credible assertion. implausible

he warbled in an implausible soprano.

The plot of the movie was so implausible that I couldn't enjoy it.

It is implausible that she would quit her job without a backup plan.

The witness gave an implausible explanation for his absence during the crime.

The idea of traveling to Mars for vacation seems implausible at the moment.

The detective found the suspect's alibi to be implausible.

It is implausible that he would have forgotten his own birthday.

The teacher found the student's excuse for not doing the homework implausible.

The theory proposed by the scientist was considered implausible by the research community.

It's implausible that the company would suddenly go bankrupt with no warning signs.

The witness provided an implausible account of the events leading up to the accident.