Oxford Dictionary English

    childish

    adjective
    adjective
    BrE BrE//ˈtʃaɪldɪʃ//
    ; NAmE NAmE//ˈtʃaɪldɪʃ//
    Youth, Stupid
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  1. 1connected with or typical of a child childish handwriting
  2. 2(disapproving) (of an adult) behaving in a stupid or silly way synonym immature Don't be so childish! opposite mature compare childlike
See childish in the Oxford Advanced American Dictionary
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