Something that's implausible is farfetched or unlikely. If it's 3pm and you still have to study for three exams and write an essay before midnight, it’s implausible that you’ll also have time to watch a movie.

The adjective implausible breaks down into im, meaning “not,” and "plausible," meaning likely. So it simply means "not likely." Implausible ideas or stories usually get high marks for creativity, but they're just too crazy to be believable. But as philosopher Rene Descartes noted, “One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.”

Definitions of implausible

adj highly imaginative but unlikely

“an implausible explanation”
has little chance of being the case or coming about

adj having a quality that provokes disbelief

“gave the teacher an implausible excuse”
incredible, unbelievable
beyond belief or understanding
improbable, unbelievable, unconvincing, unlikely
having a probability too low to inspire belief
apparently reasonable and valid, and truthful
believable, credible
capable of being believed
capable of being supported by argument
glib, pat, slick
having only superficial plausibility
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