/ ˌɪnɪˈfektɪv; NAmE / adjective
ineffective (in doing sth) not achieving what you want to achieve; not having any effect :
The new drug was ineffective.
ineffective management
The law proved ineffective in dealing with the problem.
OPP effective
► in·ef·fect·ive·ness noun [ U ]
► in·ef·fect·ive·ly adverb
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WORD ORIGIN
mid 17th cent.: from in- + effective .