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efficient has 1 distinct synonym spread across 1 of its 2 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 inefficient.
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.
being effective without wasting time or effort or expense
“an efficient production manager”
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...”
Synonyms, antonyms and the broader and narrower relations for efficient come from Princeton University’s WordNet. Full sources and licences.