Definition of implausible adjective from the Oxford Advanced Learner's Dictionary

 

implausible

 adjective
adjective
BrE BrE//ɪmˈplɔːzəbl//
 
; NAmE NAmE//ɪmˈplɔːzəbl//
 
 
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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 plausibleExtra examples These results might be considered implausible. This idea is totally implausible. This is a highly implausible claim.
See the Oxford Advanced American Dictionary entry: implausible