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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
the belief that every problem has a solution based in technology
an occasion when a lot of people gather together, especially for a religious festival
any random process, such as a competition in which a name is drawn from a hat
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American definition of immature from the online English dictionary from Macmillan Publishers Limited.