seedy has 12 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. Its one recorded opposite is seedless.
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.
somewhat ill or prone to illness
“my poor ailing grandmother”
Synonyms, antonyms and the broader and narrower relations for seedy come from Princeton University’s WordNet. Full sources and licences.