Childish
来自Big Physics
wiktionary
From Middle English childissh, from Old English ċildisċ. Equivalent to child + -ish.
etymonline
childish (adj.)
Old English cildisc "proper to a child;" see child + -ish. Meaning "puerile, immature, like a child" in a bad sense is from early 15c. Similar formation in Old Saxon kindisc, Middle Dutch kintsch, Dutch kindsch, German kindisch. Related: Childishly; childishness.
