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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 ​peopleexpect from someone of ​yourage: 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 ​yetcompletelygrown 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 ​completelydevelopedphysically, ​mentally, or ​emotionally, or ​lacking the ​expectedtype of ​responsiblebehavior for ​yourage: 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

Just who is driving this thing?
Just who is driving this thing?
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