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Adjective: inefficient  ,i-ni'fi-shunt
  1. Lacking the ability or skill to perform effectively; inadequate
    "inefficient workers";
    - ineffective
  2. Not producing desired results; wasteful
    "an inefficient campaign against drugs"; "outdated and inefficient design and methods"

See also: incompetent, ineffective, ineffectual, uneconomical, uneffective, wasteful

Antonym: efficient

Encyclopedia: Inefficient