<p><strong>Adjective</strong></p><ul><li>failing in or neglectful of a duty or obligation;</li><li>guilty of a misdeed or offense.</li><li>(of an account, tax, debt, etc.) past due;</li><li>overdue.</li><li>of or relating to delinquents or delinquency: delinquent attitudes.</li></ul><p><strong>Noun</strong></p><ul><li>a person who is delinquent.</li><li>juvenile delinquent.</li></ul>