neglected child; child left to their own devices
Refers to a child whose parents are neglectful, allowing them to roam unsupervised. Often used in contexts of child welfare or social commentary.
See also: 放置
The problem of neglected children is becoming more serious in the community.
He grew up as a neglected child and didn't receive an adequate education.
Compound of 放置 (neglect) and 子 (child). The exact origin is uncertain, but it likely emerged in modern Japanese to describe children left unsupervised due to parental neglect.