developed has 1 distinct synonym 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 one recorded opposite is undeveloped.
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.
being changed over time so as to be e.g. stronger or more complete or more useful
“the developed qualities of the Hellenic outlook”
1 of the 3 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 developed.
Synonyms, antonyms and the broader and narrower relations for developed come from Princeton University’s WordNet. Full sources and licences.