Longman Dictionary of Contemporary English homepage

implausible

 adjective
     
im‧plau‧si‧ble
difficult to believe and therefore unlikely to be true [≠ plausible]
implausible theory/idea/explanation etc
Margaret found his excuse somewhat implausible.
It's not entirely implausible that a galaxy could be identical to our own.
—implausibly adverb
—implausibility noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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