1. Lacking in liveliness or animation
   "he was so dull at parties"; "a dull political campaign"; "a large dull impassive man"; "dull days with nothing to do"; "how dull and dreary the world is"; "fell back into one of her dull moods"
   -

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. Deaden (a sound or noise), especially by wrapping
   - muffle, mute, damp, dampen, tone down 
4. Make numb or insensitive
   - numb, benumb, blunt 
5. Make dull or blunt
   "Too much cutting dulls the knife's edge"
   - blunt 
6. Become less interesting or attractive
   - pall 
7. Make less lively or vigorous
   "Middle age dulled her appetite for travel"

Derived forms: dullest, dulling, dulls, duller, dulled

See also: arid, blunt, blunted, bovine, brightness, brightness level, cloudy, colorless [US], colourless [Brit, Cdn], deadened, desiccate, desiccated, drab, dreary, dullard, dulled, dullness, dully, edgeless, flat, heavy, humdrum, inactive, insensitive, lackluster [US], lacklustre [Brit, Cdn], leaden, light, luminance, luminosity, luminousness, lusterless [N. Amer], lustreless [Brit, Cdn], mat, matt, matte, matted, monotonous, monotonousness, nonresonant, soft, spiritless, stupid, subdued, unanimated, uninteresting, unpolished, unreverberant, unsaturated, unsharpened

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

Antonym: bright, lively, sharp, sharpen

Encyclopedia: Dull Dull, Perth & Kinross Dull, Perth and Kinross

• vertical angle
• vertical bank
• vertical circle
• vertical combination
• vertical file
• vertical fin
• vertical flute
• vertical integration
• vertical section
• vertical stabiliser
• vertical stabilizer
• vertical surface
• vertical tail
• vertical union
• verticality
• vertically
• verticalness
• verticil
• verticillate
• verticillated
• verticilliosis
• verticillium
• vertiginous
• vertigo
• vertu