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English definition of “immature”

immature

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