1. Lacking in liveliness or animation (synset 300810082)
    "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"
  2. Emitting or reflecting very little light (synset 300284569)
    "a dull glow"; "dull silver badly in need of a polish"; "a dull sky"
  3. Being or made softer or less loud or clear (synset 301457764)
    "the dull boom of distant breaking waves"; "muffled drums"; "the muffled noises of the street"; "muted trumpets"
  4. So lacking in interest as to cause mental weariness (synset 301348155)
    "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"; "tedious days on the train"; "the tiresome chirping of a cricket"; "other people's dreams are dreadfully wearisome"
  5. (of color) very low in saturation;
    Highly diluted (synset 300395053)
    "dull greens and blues"
  6. Not keenly felt (synset 300807541)
    "a dull throbbing"; "dull pain"
  7. Slow to learn or understand;
    Lacking intellectual acuity (synset 300442596)
    "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"; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
  8. (of business) not active or brisk (synset 300037111)
    "business is dull (or slow)"; "a sluggish market"
  9. Not having a sharp edge or point (synset 300803819)
    "the knife was too dull to be of any use"
  10. Blunted in responsiveness or sensibility (synset 302114914)
    "a dull gaze"; "so exhausted she was dull to what went on about her"
  11. Not clear and resonant;
    Sounding as if striking with or against something relatively soft (synset 302018718)
    "the dull thud"; "thudding bullets"
  12. Darkened with overcast (synset 300464282)
    "a dark day"; "a dull sky"; "the sky was leaden and thick"
  1. Make dull in appearance (synset 201248885)
    "Age had dulled the surface"
  2. Become dull or lusterless in appearance;
    Lose shine or brightness (synset 200392673)
    "the varnished table top dulled with time"
  3. Deaden (a sound or noise), especially by wrapping (synset 202195757)
  4. Make numb or insensitive (synset 202119756)
    "The shock numbed her senses"
  5. Make dull or blunt (synset 201249008)
    "Too much cutting dulls the knife's edge"
  6. Become less interesting or attractive (synset 200539279)
  7. Make less lively or vigorous (synset 200392374)
    "Middle age dulled her appetite for travel"

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