implausible Synonyms

difficult to believe beyond belief unthinkable unbelievable unsatisfactory weak unsubstantial unreasoned unreasonable unlooked unlikely uncredible unconceivable thin tenuous unrealistic unimaginable cock-and-bull hard to swallow highly unlikely unpersuasive unimagined unfeasible uncorroborated unconvincing unattainable unachievable out of the question not likely untenable unplausible tall suspect impossible illogical flimsy fishy feeble farfetched fantastic fanciful extravagant dubitable dubious doubtful debatable crazy improbable inadequate sophistic