unworkable
un‧work‧a‧ble /ʌnˈwɜːkəbəl $ -ɜːr-/
adjective
un‧work‧a‧ble /ʌnˈwɜːkəbəl $ -ɜːr-/
adjective Word Family: noun: work, workaholic, worker, working, WORKINGS; adjective: workable ≠ unworkable, overworked, working; verb: work, rework
an unworkable plan, system, law etc is not likely to be successful