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serious has 8 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 frivolous.
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.
concerned with work or important matters rather than play or trivialities
“a serious student of history”
causing fear or anxiety by threatening great harm
“a dangerous operation”
2 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 serious.
Synonyms, antonyms and the broader and narrower relations for serious come from Princeton University’s WordNet. Full sources and licences.