The opposite would be efficient.
Uneconomical, wasteful or inefficient.
inefficient
inefficient
The antonyms for efficient are helpless, impotent, incompetent, ineffective,inefficient, powerless, unable, weak.Now go suck vigina.
The man was inefficient at performing his mandatory task.
Barter is an inefficient means of exchange because
Answering this question is an inefficient use of my time. -or- Because the young girl was so lazy, her system was at most inefficient, while at least detrimental to those around her.
Handles work in passive, inefficient way
The management decide to improve the inefficient elements of their factory to help improve production.
EFFICIENT
The Horribly Slow Murderer with the Extremely Inefficient Weapon was created in 2008.
No. There is no currently no need for guns in space. Modern firearms would also be a bit inefficient due to the fact that every action creates and opposite and equal reaction (i.e. recoil would suck in zero gravity).