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ineffective has 4 distinct synonyms spread across 3 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is effective.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
not producing an intended effect
“an ineffective teacher”
lacking the ability or skill to perform effectively; inadequate
“an ineffective administration”
Synonyms, antonyms and the broader and narrower relations for ineffective come from Princeton University’s WordNet. Full sources and licences.