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English definition of “immature”

immature

adjective     /ˌɪm.əˈtʃʊər/ US  /-ˈtʊr/
C2 disapproving not behaving in a way that is as calm and wise as people expect from someone of your age: Stop being so silly and immature, Ben! She's rather immature for her age, don't you think?Physically and mentally mature and immature disapproving not having much experience of something: politically immaturePhysically and mentally mature and immature specialized biology not yet completely grown or developed: While the animals are still immature, they do not breed.Physically and mentally mature and immature immaturity     /-ˈtʃʊə.rɪ.ti/ US  /-ˈtʊr.ə.t̬i/ noun [U] Physically and mentally mature and immature
(Definition of immature adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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