immature - definition and synonyms

adjective 

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/ˌɪməˈtjʊə(r)/
  1. 1
    an immature person behaves in a silly way, as though they are much younger than they really are

    I don’t know why you like him – he’s so immature.

     Synonyms and related words
    1. a.
      used about someone’s behaviour

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

derived word

immaturity

 

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/ˌɪməˈtjʊərəti/
noun [uncountable]