feasible Antonyms

impossible to believe absolutely impossible dead as mutton as dead as mutton unsustainable unrealizable unfeasible undoable unattainable unaccepted out of the question without a doubt beyond belief unworkable highly unlikely highly improbable hardly likely highly unbelievable highly implausible highly doubtful hard to swallow going for nothing extremely unbelievable extremely improbable extremely implausible extremely hard to believe extremely doubtful beyond all reason extremely unlikely extremely difficult to believe unbelievable nonviable unprofitable impractical impracticable impossible implausible hopeless futile farfetched fantastic dreadful disagreeable disadvantageous cureless bullheaded improbable improper inappropriate unsuitable