infantile
/ˈɪnfəntaɪl/adjective
1- of or occurring among babies or very young children婴儿的, 幼儿的：
infantile colic.
婴儿急腹痛。
1.1
- derogatory childish〈贬〉幼稚的; 孩子气的：
infantile jokes.
幼稚的玩笑。
派生词
infantility
noun （pl. -ies）词源
late Middle English: from French, or from Latin infantilis, from infans, infant- （see INFANT）.