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implausible

[im-plaw-zuh-buh l]
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adjective
  1. not plausible; not having the appearance of truth or credibility: an implausible alibi.
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Origin of implausible

First recorded in 1595–1605; im-2 + plausible
Related formsim·plau·si·bil·i·ty, im·plau·si·ble·ness, nounim·plau·si·bly, adverb

Synonyms

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unlikely, improbable, unbelievable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for implausible

implausible

adjective
  1. not plausible; provoking disbelief; unlikely
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Derived Formsimplausibility or implausibleness, nounimplausibly, adverb
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

Word Origin and History for implausible

adj.

c.1600, from assimilated form of in- "not, opposite of" (see in- (1)) + plausible. Related: Implausibly.

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Online Etymology Dictionary, © 2010 Douglas Harper