UNACHIEVABLE
a.That cannot be done or accomplished.
unachievable
un a chiev a ble |ˌənəˈCHēvəbəl ˌənəˈtʃivəbəl | ▶adjective (of an aim or objective ) too difficult to be achieved: an unachievable political goal.
unachievable |ʌnəˈtʃiːvəb (ə )l | ▶adjective (of an aim or objective ) too difficult to be achieved: an unachievable political goal.