the.com/delinquent

means Failing to do something required, like paying a bill on time, or behaving in a way that breaks rules or laws, often said of minors who get in trouble.

from From Latin delinquere, 'to fail' or 'to offend' — built from de- (completely, away) plus linquere, 'to leave.' The same linquere root gives us 'relinquish.' So a delinquent is, at the word's core, someone who has 'left behind' a duty — the debt unpaid, the obligation abandoned. English borrowed it in the 1400s mostly as a legal term for the failing itself, and only later let it harden into a label for the person doing the failing, especially wayward youths.