Inefficient
/ˌɪnɪˈfɪʃənt/
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Definition
(adj) Not efficient; not producing the effect intended or desired; inefficacious.
Sentence Examples
The program's memory management was so inefficient that it actually damaged the RAM somehow!
Trying to beat some kid's high score is an inefficient use of your time.
CEFR Practice Quiz
The old heating system is very ____ and costs a lot of money to run during the winter months.