[1] : The Collaborative International Dictionary of English v.0.48

dullness \dull"ness\, n.
   the state of being dull; slowness; stupidity; heaviness;
   drowsiness; bluntness; obtuseness; dimness; want of luster;
   want of vividness, or of brightness. written also
   dulness.
   1913 webster

         and gentle dullness ever loves a joke.   --pope.
   1913 webster
see also:
dulness 

[2] : WordNet (r) 2.0

dullness
     n 1: the quality of being slow to understand syn: dulness, obtuseness
     2: the quality of lacking interestingness syn: dulness
     3: a lack of visual brightness syn: dulness ant: brightness
     4: without sharpness of edge or point syn: dulness, bluntness
        ant: asperity, sharpness
see also:
dulness obtuseness brightness bluntness asperity sharpness 

[3] : Moby Thesaurus II by Grady Ward, 1.0

347 moby thesaurus words for "dullness":
   abruptness, absence of color, acedia, achromaticity, achromatism,
   adynamia, aloofness, analgesia, anemia, anesthesia, angst, anguish,
   anxiety, apathy, aridity, aridness, ashiness, asininity, ataraxia,
   ataraxy, atony, autism, barrenness, benumbedness, blah,
   blah feeling, blahs, blockishness, bloodlessness, bluffness,
   bluntness, boobishness, boorishness, boredom, boringness, bovinity,
   cachexia, cachexy, cadaverousness, callousness, canescence,
   catatonia, cheerlessness, chill, chilliness, chloranemia,
   cloddishness, cold blood, cold heart, coldness, colorlessness,
   coma, comatoseness, commonness, commonplaceness, coolness,
   cowardice, crassness, crudeness, deadness, deadpan,
   dearth of ideas, deathly hue, deathly pallor, debilitation,
   debility, denseness, density, detachment, dim-wittedness, dimness,
   discomfort, discomposure, discontent, disinterest, dislike,
   dispassion, dispassionateness, displeasure, disquiet,
   dissatisfaction, doltishness, drabness, dread, drowsiness, dryness,
   dull-wittedness, dullardism, dumbness, duncery, easy temper,
   electronarcosis, emotional deadness, emotionlessness, emptiness,
   enervation, ennui, etiolation, even temper, existential woe,
   exsanguination, fadedness, faintness, fairishness, fairness,
   fatigue, feebleness, flabbiness, flaccidity, flatness, frigidity,
   frostiness, ghastliness, glaucescence, glaucousness, good temper,
   gray, grayishness, grayness, grimness, grossness, haggardness,
   heartlessness, heaviness, hebetude, hopelessness, huelessness,
   humdrumminess, humdrumness, hypochromia, hypochromic anemia,
   iciness, immovability, impassibility, impassiveness, impassivity,
   imperception, imperceptiveness, imperceptivity, impercipience,
   imperturbability, imperturbableness, impotence, inanimation,
   inappetence, inconsiderateness, indifference, inexcitability,
   inexcitableness, infecundity, infertility, inirritability,
   inquietude, insensibility, insensibleness, insensitiveness,
   insensitivity, insentience, insipidness, insouciance, irksomeness,
   jadedness, joylessness, lack of affect, lack of appetite,
   lack of bite, lack of feeling, lack of pleasure, lack of touch,
   lackadaisicalness, lackluster, languidness, languishment, languor,
   languorousness, lassitude, leadenness, lenitude, lentor,
   lethargicalness, lethargy, lifelessness, lightness, listlessness,
   lividity, lividness, long-windedness, loutishness, lumpishness,
   malaise, matter-of-factness, mediocreness, mediocrity,
   middlingness, moderateness, modestness, modesty, monotonousness,
   mousiness, muddiness, muffled tone, mutedness, narcosis,
   narcotization, nausea, neutral tint, ninnyism, nonchalance,
   nongratification, nonsatisfaction, numbness, oafdom, oafishness,
   objectivity, obtundity, obtuseness, opacity, oscitancy,
   painfulness, paleness, pallidity, pallidness, pallor, passableness,
   passionlessness, passiveness, passivity, pastiness, patience,
   phlegm, phlegmaticalness, phlegmaticness, pins and needles,
   plainness, plucklessness, poker face, prison pallor, prolixity,
   prosaicism, prosaicness, prosaism, prosiness, prostration,
   resignation, resignedness, respectability, sallowness, satedness,
   savorlessness, self-absorption, sickliness, sickly hue,
   silveriness, simpletonianism, slatiness, sleep, sleepiness, sloth,
   slothfulness, slowness, sluggishness, slumber, smokiness,
   smooth temper, soberness, softness, somberness, somnolence, sopor,
   soporifousness, sottishness, soullessness, spiritlessness, spleen,
   spunklessness, staidness, staleness, steadiness, stoicism,
   stolidity, straight face, strengthlessness, stuffiness,
   stupefaction, stupidity, stupor, supineness, tastelessness,
   tediousness, tedium, thick skin, thick-headedness,
   thick-wittedness, tiresomeness, tolerableness, tonelessness,
   toothlessness, torpidity, torpidness, torpitude, torpor,
   uncomfortableness, unconcern, uncreativeness, unease, uneasiness,
   unembellishedness, unemotionalism, unexcitability, unfancifulness,
   unfeeling, unfeelingness, unhappiness, unidealism,
   unimaginativeness, unimpressibility, unimpressionableness,
   unirritableness, unnervousness, unoriginality, unpassionateness,
   unperceptiveness, unpleasure, unpoeticalness, unresponsiveness,
   unromanticism, unsatisfaction, unsharpness, unsusceptibility,
   unsympatheticness, unteachability, untouchability, vapidity,
   veiled voice, vexation of spirit, voce velata, wanness, weakliness,
   weakness, wearifulness, weariness, wearisomeness, withdrawal,
   withdrawnness, world-weariness, wrongheadedness, yokelism

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