Efficient
Antonyms of EFFICIENT
- abortive, inexperienced, lazy, powerless, unqualified, inexpert, inefficient, fragile, inadequate, inept, incompetent, delicate, unable, sluggish, weak, inactive, empty, hollow, unfruitful, inoperative, useless, vain, bootless, worthless, helpless, impotent, incapable, ineffective, unseasoned, idle, unskillful, pointless, unskilled.