delinquent

adjective

1
past due; not paid at the scheduled time
an overdue installment
a delinquent account
2
failing in what duty requires
derelict (or delinquent) in his duty
neglectful of his duties
3
guilty of a misdeed
delinquent minors

Also useful for “delinquent”:Scrabble— High-value letters — see what it scores