child ‧ ish /ˈtʃaɪldɪʃ/ BrE AmE adjective
1 . [usually before noun] relating to or typical of a child OPP 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 SYN immature OPP mature :
Don’t be so childish!
I wish politicians would stop this childish name-calling.
► To describe someone who is as innocent, eager etc as a child, use childlike .
—childishly adverb
—childishness noun [uncountable]