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ineffective (adj.)

1650s, from in- (1) "not, opposite of" + effective. Related: Ineffectively; ineffectiveness (1744).

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Definitions of ineffective from WordNet

ineffective (adj.)
not producing an intended effect;
an ineffective teacher
ineffective legislation
Synonyms: uneffective / ineffectual
ineffective (adj.)
lacking in power or forcefulness;
Synonyms: ineffectual / unable
ineffective (adj.)
lacking the ability or skill to perform effectively; inadequate;
an ineffective administration
Synonyms: inefficient
From wordnet.princeton.edu