Longman Dictionary of Contemporary English homepage

childish

 adjective
     
child‧ish
1 [usually before noun] relating to or typical of a child [≠ adult]:
a high childish laugh
her childish excitement
2 behaving in a silly way that makes you seem much younger than you really are - used to show disapproval [= immature; ≠ mature]:
Don't be so childish!
I wish politicians would stop this childish name-calling.
! This word is generally used to suggest someone's behaviour is silly or immature. To talk about positive qualities connected with children, use childlike.
—childishly adverb
—childishness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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