Etymology
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implausible (adj.)

"not having an appearance of truth or credibility," 1670s, from assimilated form of in- "not, opposite of" (see in- (1)) + plausible. Earlier it meant "not worthy of applause" (c. 1600). Related: Implausibly.

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Definitions of implausible

implausible (adj.)
having a quality that provokes disbelief;
gave the teacher an implausible excuse
From wordnet.princeton.edu