'Dulling' definitions:

Definition of 'Dulling'

From: GCIDE

Dull \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." --Bacon. [1913 Webster]
Borrowing dulls the edge of husbandry. --Shak. [1913 Webster]
2. To make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like. [1913 Webster]
Those [drugs] she has Will stupefy and dull the sense a while. --Shak. [1913 Webster]
Use and custom have so dulled our eyes. --Trench. [1913 Webster]
3. To render dim or obscure; to sully; to tarnish. "Dulls the mirror." --Bacon. [1913 Webster]
4. To deprive of liveliness or activity; to render heavy; to make inert; to depress; to weary; to sadden. [1913 Webster]
Attention of mind . . . wasted or dulled through continuance. --Hooker. [1913 Webster]