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.
The management decide to improve the inefficient elements of their factory to help improve production.
inefficient
The man was inefficient at performing his mandatory task.
They are incredibly inefficient.
He chastised his partner of being inefficient in doing all the work. This is an example using the word chastise.
The sentence contains a metaphor. The comparison of the regiment to a machine conveys the idea that it is worn out and inefficient.
The thermal energy output of the new engine was inefficient, as the thermometer quickly demonstrated.
Using petroleum in a sentence?
Uneconomical, wasteful or inefficient.
The contract stipulates that the work must be completed by the end of the month.
I am not writing a sentence using that word.
The wind was too strong, so I had to wind up my kite to keep it from blowing away.