possible Antonyms

impossible unobtainable unthinkable unworkable unbelievable nonviable no-go unbridgeable out to airtight vain unsurmountable unimaginable inviable out of play beyond reach unrealizable unplayable unfeasible unfathomed undoable unattainable unachievable untempered unstoppable out of the question unsufferable unmasterable infeasible inconceivable incogitable improbable impractical impracticable cureless implausible hopeless figurate farfetched insolvable insuperable unlikely undreamt undreamed unconceivable paradoxical out ordinal numerative logometric