delinquent

[1]	juvenile delinquent , malefactor , (young/youthful) offender , wrongdoer , lawbreaker , culprit , criminal , miscreant , hooligan , ruffian , roughneck

adj.

[1]	neglectful , negligent , derelict , remiss , failing , defaulting
[2]	overdue , past due , in arrears , late , unpaid