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Meaning of “immature” in the English Dictionary

"immature" in British English

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immatureadjective

uk   /ˌɪm.əˈtʃʊər/  us   /ˌɪm.əˈtʊr/
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, Chris! 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   /ˌɪm.əˈtʃʊə.rə.ti/  us   /ˌɪm.əˈtʊr.ə.t̬i/
physical/emotional immaturity
(Definition of immature from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"immature" in American English

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immatureadjective

 us   /ˌɪm·əˈtʃʊər, -ˈtʊər/
not completely developed physically, mentally, or emotionally, or lacking the expected type of responsible behavior for your age: Some of the boys in my class are so immature – they’re always doing silly things.
immaturity
noun [U]  us   /ˌɪm·əˈtʃʊər·ɪ·t̬i, -ˈtʊər-/
physical/emotional immaturity
(Definition of immature from the Cambridge Academic Content Dictionary © Cambridge University Press)
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“immature” in British English

“immature” in American English

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