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effective has 6 distinct synonyms spread across 3 of its 6 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 ineffective.
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.
producing or capable of producing an intended result or having a striking effect
“an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation”
able to accomplish a purpose; functioning effectively
“people who will do nothing unless they get something out of it for themselves are often highly effective persons...”
3 of the 6 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for effective.
Synonyms, antonyms and the broader and narrower relations for effective come from Princeton University’s WordNet. Full sources and licences.