inefficaciousness

/ˌɪnɛfɪˈkeɪʃəsnəs/
noun
  1. The quality or state of failing to produce the desired effect; lack of effectiveness.
    • Critics pointed to the inefficaciousness of the new law in reducing crime rates.
    • The inefficaciousness of the treatment was disappointing for the patients.
    • The inefficaciousness of the marketing campaign led to a drop in sales.
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