1. Made dull or blunt
   "The dulled knife was useless for cutting vegetables";
   - blunted
    
2. Deprived of colour
   "colours dulled by too much sun";
   - greyed [Brit, Cdn], grayed [US]
    
3. Having lost or been caused to lose interest because of overexposure
   "the mind of the audience is becoming dulled";
   - benumbed

1. Make dull in appearance
   "Age had dulled the surface"
    
2. Become dull or lusterless in appearance; lose shine or brightness
   "the varnished table top dulled with time"
    
3. Make dull or blunt
   "Too much cutting dulls the knife's edge";
   - blunt
    
4. Become less interesting or attractive
   "The constant repetition dulled the impact of the message";
   - pall
    
5. Make less lively or vigorous
   "Middle age dulled her appetite for travel"
    
6. Deaden (a sound or noise), especially by wrapping
   "They dulled the drum sound with blankets";
   - muffle, mute, damp, dampen, tone down
    
7. Make numb or insensitive
   "The shock dulled her senses";
   - numb, benumb, blunt

See also: colorless [US], colourless [Brit, Cdn], dull, uninterested

Type of: alter, change, desensitise [Brit], desensitize, modify, soften, weaken

Encyclopedia: Dull, Perthshire