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implausible (adj) unlikely; unbelievable.
An implausible explanation, for example, is an explanation that appears difficult to believe. An implausible theory is highly illogical and so unacceptable. Anything implausible is unconvincing.
- That he refused to lend me money to teach me thrift is implausible. It is only to cover his unwillingness to lend me because he doubts my intention and ability to pay back.
- Though his explanation that his gun was placed by the dead body by the murderers seems implausible, it is indeed the fact.