DULL (2)

dull (2). Dull, v.t. to stupify, blunt, clog, damp, sadden

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Dull, v. t. [imp. & p. p. Duller (?); p. pr. & vb. n. Dulling.] 1. 1. To deprive of sharpness of edge or point. “This . . . dulled their swords.” Bacon.
Borrowing dulls the edge of husbandry. Shak. 2. 2. To make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like.
Those she has Will stupefy and dull the sense a while. Shak. Use and custom have so dulled our eyes. Trench. 3. 3. To render dim or obscure; to sully; to tarnish. “Dulls the mirror.” Bacon.
4. 4. To deprive of liveliness or activity; to render heavy; to make inert; to depress; to weary; to sadden.
Attention of mind . . . wasted or dulled through continuance. Hooker.