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Definition of inefficient:

  1. Incapable of, or indisposed to, effective action; habitually slack or remiss; effecting little or nothing; as, inefficient workmen; an inefficient administrator.
  2. Not efficient; not producing the effect intended or desired; inefficacious; as, inefficient means or measures.

Synonyms:

wasteful, ineffective, unworkmanlike, unskilled, inexpert, unable, unproductive, ineffectual, uneconomical, incapable, inefficacious, inapt, ability, uneffective, useless, unskillful, affect, incompetent.

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