°Late or failing to pay a
debt or other financial obligation, like a mortgage or loan.
"Fred is delinquent in making his car payment."
°Failing in or neglectful of a duty or obligation; guilty of a misdeed or offense.
noun
°(obsolete) a term applied to
royalists by their opponents in the English Civil War 1642 - 1645. Charles I was known as the chief delinquent.