de·lin·quent 
(dĭ-lĭngkwənt, -lĭn-)
(dĭ-lĭngkwənt, -lĭn-)adj.
1. Failing to do what law or duty requires.
2. Overdue in payment: a delinquent account.
n.
1. A juvenile delinquent.
2. A person who neglects or fails to do what law or duty requires.
[Latin dēlinquēns, dēlinquent-, present participle of dēlinquere, to offend : dē-, de- + linquere, to leave, abandon; see leikw- in the Appendix of Indo-European roots.]
de·linquent·ly adv.