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immature

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adjective immature pronunciation in British English /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.

    1. a.
      used about someones behaviour

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

derived word

immaturity

 immature pronunciation in British English /ˌɪməˈtjʊərəti/ noun [uncountable]

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… a teaching method in which groups of children learn independently using a computer linked to the internet

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