The Collaborative International Dictionary of English v.0.48:
Dull \Dull\, v. t. [imp. & p. p. Duller; p. pr. & vb. n.
1. To deprive of sharpness of edge or point. "This . . .
dulled their swords." --Bacon.
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
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
Moby Thesaurus II by Grady Ward, 1.0:
43 Moby Thesaurus words for "dulling":
abating, allaying, alleviating, alleviative, analgesic, anesthetic,
anodyne, assuaging, assuasive, balmy, balsamic, benumbing,
blunting, cathartic, chastening, cleansing, cushioning, dampening,
damping, deadening, demulcent, diminishing, easing, emollient,
lenitive, lessening, mitigating, mitigative, narcotic, numbing,
pain-killing, palliative, purgative, reducing, relaxing, relieving,
remedial, softening, soothing, stunning, stupefying, subduing,