Adjective dull has 12 senses
  1. dull - 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"
    Antonyms:
    lively, alive, bouncing, bouncy, peppy, spirited, zippy, breezy, bubbly, bubbling, effervescent, scintillating, sparkling, sparkly, burbling, burbly, effusive, gushing, live, warm
  2. dull - emitting or reflecting very little light; "a dull glow"; "dull silver badly in need of a polish"; "a dull sky"
    Antonyms:
    bright, agleam, gleaming, nitid, aglow, glowing, lambent, lucent, luminous, aglitter, coruscant, fulgid, glinting, glistering, glittering, glittery, scintillant, scintillating, sparkling, sparkly, beady, beadlike, buttony, buttonlike, beaming, beamy, effulgent, radiant, refulgent, blazing, blinding, dazzling, fulgent, glaring, glary, blinking, brilliant, flashing, glimmering, glimmery, glistening, glossy, lustrous, sheeny, shiny, shining, iridescent, nacreous, opalescent, opaline, pearlescent, lurid, noctilucent, shimmery, silver, silvern, silvery, bright as a new penny, ardent, twinkling
  3. dull, muffled, muted, softened - being or made softer or less loud or clear; "the dull boom of distant breaking waves"; "muffled drums"; "the muffled noises of the street"; "muted trumpets"
    Antonym: loud (indirect, via soft)
  4. boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome - so lacking in interest as to cause mental weariness; "a boring evening with uninteresting people"; "the deadening effect of some routine tasks"; "a dull play"; "his competent but dull performance"; "a ho-hum speaker who couldn't capture their attention"; "what an irksome task the writing of long letters is"- Edmund Burke; "tedious days on the train"; "the tiresome chirping of a cricket"- Mark Twain; "other people's dreams are dreadfully wearisome"
    Antonym: interesting (indirect, via uninteresting)
  5. dull - (of color) very low in saturation; highly diluted; "dull greens and blues"
    Antonyms:
    saturated, pure (indirect, via unsaturated)
  6. dull - not keenly felt; "a dull throbbing"; "dull pain"
    Antonyms:
    sharp, acute, intense, cutting, keen, knifelike, piercing, stabbing, lancinate, lancinating, fulgurating, scratching, salt
  7. dense, dim, dull, dumb, obtuse, slow - slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
    Antonym: smart (indirect, via stupid)
  8. dull, slow, sluggish - (of business) not active or brisk; "business is dull (or slow)"; "a sluggish market"
    Antonym: active (indirect, via inactive)
  9. dull - not having a sharp edge or point; "the knife was too dull to be of any use"
    Antonyms:
    sharp, carnassial, cutting, edged, incisive, piercing, keen, knifelike, penetrative, penetrating, sharpened, razor-sharp
  10. dull - blunted in responsiveness or sensibility; "a dull gaze"; "so exhausted she was dull to what went on about her"- Willa Cather
    Antonym:
    sensitive (indirect, via insensitive)
  11. dull, thudding - not clear and resonant; sounding as if striking with or against something relatively soft; "the dull thud"; "thudding bullets"
    Antonyms: reverberant, ringing (indirect, via unreverberant)
  12. dull, gray, grey, leaden - darkened with overcast; "a dark day"; "a dull sky"; "a gray rainy afternoon"; "gray clouds"; "the sky was leaden and thick"
    Antonym: clear (indirect, via cloudy)
,Verb dull has 7 senses
  1. dull - make dull in appearance; "Age had dulled the surface"
    --1 is one way to
    change, alter, modify
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. dull - become dull or lusterless in appearance; lose shine or brightness; "the varnished table top dulled with time"
    --2 is one way to
    change
    Sample sentence:
    Something ----s
  3. muffle, mute, dull, damp, dampen, tone down - deaden (a sound or noise), especially by wrapping
    --3 is one way to soften
    Sample sentences:
    Somebody ----s something
    Something ----s something
  4. numb, benumb, blunt, dull - make numb or insensitive; "The shock numbed her senses"
    --4 is one way to desensitize, desensitise
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
    Something ----s somebody
  5. dull, blunt - make dull or blunt; "Too much cutting dulls the knife's edge"
    --5 is one way to change, alter, modify
    Antonyms: sharpen
    Sample sentences:
    Somebody ----s something
    Something ----s something
  6. pall, dull - become less interesting or attractive
    --6 is one way to change
    Derived form: noun dullard2
    Sample sentence:
    Something ----s
  7. dull - make less lively or vigorous; "Middle age dulled her appetite for travel"
    --7 is one way to
    weaken
    Sample sentences:
    Somebody ----s something
    Something ----s something
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