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English definition of “childish”

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childish

adjective  /ˈtʃɑɪl·dɪʃ/ us  
like or typical of a child, or intended for children: a childish body The pictures made the magazine look childish. When you describe the behavior of an adult or an older child as childish, you mean the person is behaving in a foolish way that is typical of a young child’s behavior.
childishly
adverb  /ˈtʃɑɪl·dɪʃ·li/ us  
Kate is 43, but she can be childishly impatient.
(Definition of childish from the Cambridge Academic Content Dictionary © Cambridge University Press)
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