organized has 3 distinct synonyms spread across 1 of its 3 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 2 recorded opposites are unorganized, disorganized.
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.
formed into a structured or coherent whole, particularly on a large scale
“organized medicine”
methodical and efficient in arrangement or function
“how well organized she is”
being a member of or formed into a labor union
“organized labor”
Synonyms, antonyms and the broader and narrower relations for organized come from Princeton University’s WordNet. Full sources and licences.