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Synonyms

implausible

American  
[im-plaw-zuh-buhl] / ɪmˈplɔ zə bəl /

adjective

  1. not plausible; not having the appearance of truth or credibility.

    an implausible alibi.

    Synonyms:
    unbelievable, improbable, unlikely

implausible British  
/ ɪmˈplɔːzəbəl /

adjective

  1. not plausible; provoking disbelief; unlikely

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of implausible

First recorded in 1595–1605; im- 2 + plausible

Explanation

Something that's implausible is farfetched or unlikely. If it's 3 pm 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 René Descartes noted, “One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.”

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Vocabulary lists containing implausible

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

When the skin has collapsed into your palm like a deflated balloon, you lift the box grater and discover an almost implausible amount of ruby pulp underneath it.

From Salon Aug. 1, 2026

"AI memory demand remains ferocious, supply remains tight, and the major memory makers are enjoying margins that would have looked implausible only a few years ago."

From Barron's Jul. 7, 2026

It was a margin that seemed implausible in the opening exchanges.

From BBC Jul. 4, 2026

The broader biographical facts are obeyed, but “Amadeus” is fundamentally ahistorical, and sometimes implausible: It is to be trusted only as television.

From Los Angeles Times May 8, 2026

I stared at the Rockies from my bedroom window and was struck by how implausible they seemed.

From "Educated" by Tara Westover

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