unplausible

adjective
un·plau·si·ble | \ ˌən-ˈplȯ-zə-bəl \

Definition of unplausible 

: not persuasive or believable : not plausible : implausible an unplausible explanation His story, however unplausible, might possibly be true. —P. G. Wodehouse

First Known Use of unplausible

1637, in the meaning defined above

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The first known use of unplausible was in 1637

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