(n.) Dullness; stupidity.

acedia aloofness apathy asininity ataraxia ataraxy benumbedness blah blahs blockishness boobishness boorishness boredom bovinity cloddishness coma comatoseness crassness crudeness denseness density detachment dim-wittedness dimness disinterest dispassion doltishness drowsiness dull-wittedness dullardism dullness dumbness duncery enervation ennui fatigue grossness heartlessness heaviness hopelessness inanimation inappetence indifference insouciance jadedness lack of appetite lackadaisicalness languidness languishment languor languorousness lassitude lenitude lentor lethargicalness lethargy lifelessness listlessness loutishness lumpishness ninnyism nonchalance numbness oafdom oafishness obtuseness opacity oscitancy passiveness passivity phlegm phlegmaticalness phlegmaticness plucklessness resignation resignedness satedness simpletonianism sleep sleepiness sloth slothfulness slowness sluggishness slumber somnolence sopor soporifousness sottishness spiritlessness spunklessness stolidity stupefaction stupidity stupor supineness thick-headedness thick-wittedness torpidity torpidness torpitude torpor unconcern unteachability weariness withdrawnness world-weariness wrongheadedness yokelism