operative adj
1 active, current, effective, efficient, functional, functioning, in business, in force, in operation, operational, serviceable, standing, workable
2 crucial, important, indicative, influential, key, relevant, significant n
3 artisan, employee, hand, labourer, machinist, mechanic, worker
1 ineffective, inefficient, inoperative, nonfunctional, powerless, unusable, unworkable