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inefficient

/ɪnɪˈfɪʃənt/
noun

  1. A person who cannot or does not work efficiently.

adjective

  1. Not efficient; not producing the effect intended or desired; inefficacious

    "Celery is an inefficient food."

  2. Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing

    "Jessica was terribly inefficient at cleaning, so her brother usually had to clean the whole room."

Antonymsefficient

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