unplausible
adjective
un·plau·si·ble
ˌən-ˈplȯ-zə-bəl
: not persuasive or believable : not plausible : implausible
an unplausible explanation
His story, however unplausible, might possibly be true.—P. G. Wodehouse
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Merriam-Webster unabridged
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