Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not efficient, as:
  • adj. Lacking the ability or skill to perform effectively; incompetent: an inefficient worker.
  • adj. Not producing the intended result; ineffective: an inefficient campaign against illegal drugs.
  • adj. Wasteful of time, energy, or materials: an inefficient design; outdated and inefficient methods.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not efficient; not producing the effect intended or desired, or achieiving the effect by unnnecessary and excessive expenditure of resources; inefficacious.
  • adj. Incapable of, or indisposed to, effective action; habitually slack or remiss; effecting little or nothing

from The Century Dictionary and Cyclopedia

  • Not efficient; not producing or not capable of producing the desired effect; incapable; incompetent; inadequate: as, inefficient measures; an inefficient police.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. lacking the ability or skill to perform effectively; inadequate
  • adj. not producing desired results; wasteful

Etymologies

in- +‎ efficient (Wiktionary)

Examples

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