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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