Definition of ineffective adjective from the Oxford Advanced American Dictionary

 

ineffective

 adjective
adjective
NAmE//ˌɪnɪˈfɛktɪv//
 
 
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not achieving what you want to achieve; not having any effect The new drug was ineffective. ineffective management ineffective in doing something The law proved ineffective in dealing with the problem. opposite effective
ineffectively
 
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adverb
ineffectiveness
 
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noun [uncountable] the ineffectiveness of western medicine in treating this illness
See the Oxford Advanced Learner's Dictionary entry: ineffective