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English definition of “immature”

immature

adjective     /ˌɪməˈtjʊər/
BEHAVIOUR not behaving in a way that is as wise and calm as people expect from someone your age: Some of the boys are quite immature for their age.Physically and mentally mature and immature
NOT DEVELOPED not completely developed: immature cellsYoung peoplePhysically and mentally mature and immature
immaturity noun [U]
(Definition of immature adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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