1. (noun)delinquent, juvenile delinquent a youngoffender
2. (adj)delinquent guilty of a misdeed "delinquent minors"
3. (adj)derelict, delinquent, neglectful, remiss failing in what duty requires "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills"
4. (adj)delinquent, overdue past due; not paid at the scheduled time "an overdue installment"; "a delinquent account"