uneffective

Adjective

Meaning

not producing an intended effect

Source: WordNet

Synonyms

ineffective ineffectual unable useless inefficient incapable idle futile incompetent powerless inept unprofitable toothless bungling otiose
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Antonyms

strong active successful effective powerful useful
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Examples

an ineffective teacher Source: Internet

ineffective legislation Source: Internet

Close letter words and terms

uneffaceable uneffaced uneffected uneffectual uneffectually uneffectuated