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English definition of “childish”

childish

adjective     /ˈtʃaɪl.dɪʃ/
B2 typical of a child : childish handwriting Children and babies 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. → Compare childlikePhysically and mentally mature and immature childishly     /-li/ adverb disapproving childishness     /-nəs/ noun [U] disapproving
(Definition of childish adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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