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English definition of “immature”

immature

adjective uk   /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? disapproving not having much experience of something: politically immature specialized biology not yet completely grown or developed: While the animals are still immature, they do not breed.
immaturity
noun [U] uk   /-ˈtʃʊə.rɪ.ti/ us    /-ˈtʊr.ə.t̬i/
(Definition of immature from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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