Definition of childish adjective from the Oxford Advanced Learner's Dictionary

     

    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 See related entries: Youth
  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 related entries: Youth, Stupid
See the Oxford Advanced American Dictionary entry: childish