Dull, v. t. [imp. & p. p. Duller p. pr. & vb. n. Dulling.]
1. To deprive of sharpness of edge or point. “This . . . dulled their swords.”
Borrowing dulls the edge of husbandry. --Shak.
2. To make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like.
Those [drugs] she has
Will stupefy and dull the sense a while. --Shak.
Use and custom have so dulled our eyes. --Trench.
3. To render dim or obscure; to sully; to tarnish. “Dulls the mirror.”
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.