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English definition of “immature”

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immature

adjective  /ˌɪm·əˈtʃʊər, -ˈtʊər/ us  
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]  /ˌɪm·əˈtʃʊər·ɪ·t̬i, -ˈtʊər-/ us  
physical/emotional immaturity
(Definition of immature from the Cambridge Academic Content Dictionary © Cambridge University Press)
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