baroque has 5 distinct synonyms spread across 3 of its 4 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.
the historic period from about 1600 until 1750 when the baroque style of art, architecture, and music flourished in Europe
elaborate and extensive ornamentation in decorative art and architecture that flourished in Europe in the 17th century
having elaborate symmetrical ornamentation
“the building...frantically baroque”
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for baroque.
Synonyms, antonyms and the broader and narrower relations for baroque come from Princeton University’s WordNet. Full sources and licences.