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