IPA: /ˈtʃaɪldɪʃnəs/
KK: /ˈtʃaɪldɪʃnəs/
The quality or state of being immature or behaving like a child.
His childishness often got him into trouble with his friends.
Childishness → It is formed from "child" (from Old English "cild", meaning a young human being) and "-ish" (meaning having the qualities of) and "-ness" (meaning the state or condition of). The word "childishness" refers to the state or condition of having the qualities of a child, often implying immaturity or naivety.
Think of the qualities of a 'child' and how 'childishness' means having those child-like qualities, often in a way that seems immature.