believable Antonyms

unbelievable overkill made-up unknowable dodgy unfathomable visionary unreliable unreasonable unlikely undreamt undreamed unconceivable suspicious suspensive squinter sceptical ridiculous best in category unthinkable beyond belief extremely unbelievable extremely improbable extremely implausible extremely hard to believe extremely doubtful extremely unlikely extremely difficult to believe absolutely impossible unsustainable unimagined undoable unconvincing supercalifragilisticexpialidocious unimaginable unrealistic away with the fairies amazeballs questionable preposterous phantasmal farcical fantastic fanciful expenditure dumfounding dubious doubtful derisory deranged