not seeming reasonable or likely to be true an implausible claim/idea/theory It was all highly implausible. Her explanation is not implausible. opposite plausibleadjectivejump to other results
implausiblyjump to other results
NAmE//ɪmˈplɔzəbli//adverb He argued, somewhat implausibly, that the accident could not have been prevented. She quoted an implausibly high figure.