delinquent (n.)

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" (from PIE root *leikw- "to leave"). As an adjective, from c. 1600.

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