child·ish 
/ˈtʃaɪldɪʃ/ adjective
/ˈtʃaɪldɪʃ/ adjective [more childish; most childish] : of a child or typical of a child
▪ She has a childish face. ▪ a letter written in childish scrawl ▪ He opened the gifts with childish delight. ; especially disapproving : having or showing the unpleasant qualities (such as silliness or lack of maturity) that children often have
▪ a childish prank ▪ We're tired of their childish games. ▪ I find his humor very childish. — compare childlike
▪ She has a childish face. ▪ a letter written in childish scrawl ▪ He opened the gifts with childish delight. ; especially disapproving : having or showing the unpleasant qualities (such as silliness or lack of maturity) that children often have
▪ a childish prank ▪ We're tired of their childish games. ▪ I find his humor very childish. — compare childlike
— child·ish·ly adverb
▪ a childishly simple idea
▪ a childishly simple idea
— child·ish·ness noun [noncount]
▪ She was annoyed by the childishness of his behavior.
▪ She was annoyed by the childishness of his behavior.
