delinquent

(noun) a young offender. Synonyms: juvenile delinquent.

(adj) guilty of a misdeed. Example: "Delinquent minors."

(adj) failing in what duty requires. Synonyms: derelict, neglectful, remiss. Examples: "Derelict (or delinquent) in his duty." "Neglectful of his duties." "Remiss of you not to pay your bills."

(adj) past due; not paid at the scheduled time. Synonyms: overdue. Examples: "An overdue installment." "A delinquent account."