S: (adj) delinquent (guilty of a misdeed) "delinquent minors"
S: (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"
S: (adj) delinquent, overdue (past due; not paid at the scheduled time) "an overdue installment"; "a delinquent account"