American English

Definition of childish adjective from the Oxford Advanced American Dictionary

     

    childish

     adjective
    adjective
    NAmE//ˈtʃaɪldɪʃ//
     
     
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  1. 1 (disapproving) (of an adult) behaving in a stupid or silly way synonym immature Don't be so childish! opposite mature compare childlike
  2. 2connected with or typical of a child childish handwriting
 
adverb to behave childishly
childishness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: childish