IPA: /dɪˈlɪŋkwəntli/
KK: /dɪˈlɪŋkwəntli/
In a way that shows a tendency to commit crimes or behave badly, often referring to young people.
The teenager acted delinquently, causing trouble in the neighborhood.
Delinquently → It is formed from "delinquent" (from Latin *delinquere*, meaning to fail or to offend) and the suffix "-ly" (meaning in a manner of). The word "delinquently" means in a manner that is characteristic of a failure to fulfill a duty or an offense.
Think of someone who has 'failed' ('delinquere') to meet their responsibilities, and the '-ly' shows how they act — that's why delinquently means acting in a way that reflects such failure.