inefficient
//ˌɪn.ɪˈfɪʃ.ənt//
Adjective
inefficientCanonical form
more inefficientComparative
most inefficientSuperlative
1
Not achieving maximum productivity; wasting time, energy, or resources.
The old heating system was inefficient and wasted a lot of energy.
2
Lacking the ability or skill to perform a task effectively.
The inefficient manager failed to organize the team properly.