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
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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 implausible in the Oxford Advanced Learner's DictionaryCheck pronunciation: implausible