unwearable has no recorded synonym. 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 wearable.
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.
not suitable for wear or able to be worn
“shoes so dilapidated as to be unwearable”
Synonyms, antonyms and the broader and narrower relations for unwearable come from Princeton University’s WordNet. Full sources and licences.