delinquent (n.) Look up delinquent at Dictionary.com
late 15c., from Middle French délinquant, from present participle of délinquer (15c.), and directly from Latin delinquentum (nominative delinquens), present participle of delinquere "to fail; be wanting, fall short; offend," from de- "completely" (see de-) + linquere "to leave" (see relinquish). As an adjective, from c.1600.