stylish has 1 distinct synonym spread across 2 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 styleless.
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.
having elegance or taste or refinement in manners or dress
“a little less posh but every bit as stylish as Lord Peter Wimsey”
Synonyms, antonyms and the broader and narrower relations for stylish come from Princeton University’s WordNet. Full sources and licences.