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immature has 5 distinct synonyms spread across 3 of its 5 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 mature.
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.
characteristic of a lack of maturity
“immature behavior”
(used of living things especially persons) in an early period of life or development or growth
“young people”
not yet mature
(of birds) not yet having developed feathers
“a small unfledged sparrow on the window sill”
Synonyms, antonyms and the broader and narrower relations for immature come from Princeton University’s WordNet. Full sources and licences.