uninflected 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 inflected.
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) not inflected
“uninflected words”
not inflected
“`boy' and `swim' are uninflected English words”
expressing a grammatical category by using two or more words rather than inflection
Synonyms, antonyms and the broader and narrower relations for uninflected come from Princeton University’s WordNet. Full sources and licences.