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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 British English definition of immature. View American English definition of immature.
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View the pronunciation for immature.
a generation … who are balancing working life with caring for both their teenage children and elderly parents
the sail behind the main sail on a ship
to gossip or share personal information with someone …
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Definition of immature from the online English dictionary from Macmillan Publishers Limited.