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Adjective: ineffectual  ,i-ni'fek-choo-ul
  1. Not producing an intended effect
    - ineffective, uneffective
  2. Producing no result or effect
    "the therapy was ineffectual";
    - futile, otiose, unavailing, meaningless
  3. Lacking in power or forcefulness
    "an ineffectual ruler";
    - ineffective, unable, wet [Brit, informal], useless [informal], pathetic, effete

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