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I don't know why you like him – he's so immature.
He felt a kind of immature pride in the fact that he had stolen more than his friends.
This is the American English definition of immature. View British English definition of immature.
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View the pronunciation for immature.
English version of definition of immature
a paid holiday given to a new employee before they start their job
a small round hat worn by Jewish men
an expandable stick which you attach to a mobile phone or camera to help you take a selfie …
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American definition of immature from the online English dictionary from Macmillan Publishers Limited.