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Adjective: dull (duller,dullest)  dúl
  1. Being or made softer or less loud or clear
    "the dull boom of distant breaking waves";
    - muffled, muted, softened
  2. So lacking in interest as to cause mental weariness
    "a dull play"; "his competent but dull performance";
    - boring, deadening, ho-hum [informal], irksome, slow, tedious, tiresome, wearisome, deadly [informal], unamusing, draggy [informal], mind-numbing
  3. (of colour) very low in saturation; highly diluted
    "dull greens and blues"
  4. Taking more than usual time to learn or understand; lacking intellectual acuity
    "although dull at classical learning, at mathematics he was uncommonly quick";
    - dense, dim [informal], dumb, obtuse, slow
  5. (of business) not active or brisk
    "business is dull";
    - slow, sluggish
  6. Blunted in responsiveness or sensibility
    "a dull gaze"; "so exhausted she was dull to what went on about her"
  7. Not clear and resonant; sounding as if striking with or against something relatively soft
    "the dull thud";
    - thudding
  8. Darkened with overcast
    "a dull sky";
    - leaden
  9. 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";
    - hebetudinous [rare]
  10. Emitting or reflecting very little light
    "a dull glow"; "dull silver badly in need of a polish"; "a dull sky"
  11. Not keenly felt
    "a dull throbbing"; "dull pain"
  12. Not having a sharp edge or point
    "the knife was too dull to be of any use"
Verb: dull  dúl
  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
    "The shock dulled her senses";
    - 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: dulls, dulling, dullest, duller, dulled

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

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

Antonym: bright, lively, sharp, sharpen

Encyclopedia: Dull, Perth and Kinross