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

  • adj. Not producing an intended effect; ineffectual: an ineffective plea.
  • adj. Inadequate; incompetent: an ineffective teacher.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. not having the desired effect; ineffectual
  • adj. lacking in ability; incompetent or inadequate

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not effective; not having the desired effect; ineffectual; futile; inefficient; useless.

from The Century Dictionary and Cyclopedia

  • Not effective; not producing any effect, or the effect desired; wanting effective energy or operation; inefficient; impotent: as, ineffective efforts; an ineffective blow.

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

  • adj. not producing an intended effect
  • adj. lacking in power or forcefulness
  • adj. lacking the ability or skill to perform effectively; inadequate


in- +‎ effective (Wiktionary)



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