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Adjective: implausible  im'plo-zi-bul
  1. Having a quality that provokes disbelief
    "gave the teacher an implausible excuse"

See also: cockamamie [N. Amer, informal], cockamamy [N. Amer, informal], doubtful, farfetched, far-fetched, imaginative, improbable, incredible, unbelievable, unconvincing, unlikely

Antonym: plausible

Encyclopedia: Implausible