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Phonetics
/ɪnɪˈfɪʃənt/
noun
A person who cannot or does not work efficiently.
adjective
Not efficient; not producing the effect intended or desired; inefficacious
Example: Celery is an inefficient food.Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing
Example: Jessica was terribly inefficient at cleaning, so her brother usually had to clean the whole room.