dull (v.) Copy link Outline I. To take off the brightness ofII. To take off the edge or keenness of1. hĕbĕto, 12. obtundo, stŭpĕfăcio, 3 • dull (v.): I. To take off the brightness of: obscūro, hĕbĕto, 1: v. to dim, sully. II. To take off the edge or keenness of: 1. hĕbĕto, 1: v. to blunt. 2. obtundo, stŭpĕfăcio, 3: v. to deaden.