delinquent
     adj 1: guilty of a minor misdeed; "delinquent minors"
     2: failing in what duty requires; "derelict (or delinquent) in
        his duty"; "neglectful of his duties"; "remiss of you not
        to pay your bills" [syn: {derelict}, {neglectful}, {remiss}]
     3: persistently bad; "school for delinquent boys"
     4: past due; not paid at the scheduled time; "an overdue
        installment"; "a delinquent account" [syn: {overdue}]
     n : a young offender [syn: {juvenile delinquent}]
Source: WordNet® 2.0