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Adjective: ineffective  ,i-ni'fek-tiv
  1. Not producing an intended effect
    "an ineffective teacher"; "ineffective legislation";
    - uneffective, ineffectual
  2. Lacking in power or forcefulness
    "an ineffective ruler";
    - ineffectual, unable, wet [Brit, informal], useless [informal], pathetic, effete
  3. Lacking the ability or skill to perform effectively; inadequate
    "an ineffective administration";
    - inefficient

See also: effectiveness, effectivity, effectuality, effectualness, idle, impotent, incompetent, inefficacious, inefficient, powerless, toothless, unproductive, useless