inflected 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 uninflected.
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.
(of the voice) altered in tone or pitch
“his southern Yorkshire voice was less inflected and singing than her northern one”
showing alteration in form (especially by the addition of affixes)
“`boys' and `swam' are inflected English words”
Synonyms, antonyms and the broader and narrower relations for inflected come from Princeton University’s WordNet. Full sources and licences.