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English definition of “childish”

childish

adjective uk   /ˈtʃaɪl.dɪʃ/ us  
B2 typical of a child: childish handwriting B2 disapproving If an adult is childish, they behave badly in a way that would be expected of a child: He wasn't enjoying the occasion so he thought he'd spoil it for everyone else - it was very childish of him.
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childishly
adverb uk   /-li/ disapproving us  
childishness
noun [U] uk   /-nəs/ disapproving us  
(Definition of childish from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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