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underperform 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
perform less well or with less success than expected
“John consistently underachieves, although he is very able”
perform too rarely
“Her plays are underperformed, although they are very good”
Synonyms, antonyms and the broader and narrower relations for underperform come from Princeton University’s WordNet. Full sources and licences.