Implausible
/ˌɪˈmplɔzəbəl/
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Definition
(adj) Not plausible; unlikely; dubious.
Sentence Examples
Tom came up with an implausible story.
Richa's theories can be very fascinating, even if they are implausible.
CEFR Practice Quiz
The suspect's bizarre excuse for being late was highly ____ and the police did not believe him.