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Definition immature in British English

immature adjective

adjective
/ˌɪməˈtjʊə(r)/
1

an immature person behaves in a silly way, as though they are much younger than they really are

Example

I don't know why you like him - he's so immature.

Synonyms and related words
1.1

used about someone's behaviour

Example

He felt a kind of immature pride in the fact that he had stolen more than his friends.

Synonyms and related words
2

not fully grown or developed

Example

immature plants

Synonyms and related words
Definition immature in British English