unbelievable

I adjective absurd, difficult to accept, difficult to believe, disbelieved, distrusted, doubtful, dubious, farfetched, hard to believe, implausible, improbable, inconceivable, incredible, open to doubt, open to suspicion, palpably false, questionable, staggering, suspect, suspicious, unconvincing, unimaginable, unlikely, untenable, unthinkable II index debatable, disputable, doubtful, implausible, impossible, incredible, ludicrous, remarkable, suspicious (questionable), uncanny