American English

Definition of implausible adjective from the Oxford Advanced American Dictionary

 

implausible

 adjective
adjective
NAmE//ɪmˈplɔzəbl//
 
 
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not seeming reasonable or likely to be true an implausible claim/idea/theory It was all highly implausible. Her explanation is not implausible. opposite plausible
implausibly
 
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NAmE//ɪmˈplɔzəbli//
 
adverb He argued, somewhat implausibly, that the accident could not have been prevented. She quoted an implausibly high figure.
See the Oxford Advanced Learner's Dictionary entry: implausible