- Lacking the ability or skill to perform effectively; incompetent.An inefficient worker.
- Not producing the intended result; ineffective.An inefficient campaign against illegal drugs.
- Not producing the desired effect with a minimum use of energy, time, etc.; ineffective.
- Lacking the necessary ability; unskilled; incompetent.
An inefficient design; outdated and inefficient methods.
Origin of inefficient
- in- + efficient