Synonyms and related words :
accidia, acedia, aloofness, apathy, ataraxia, ataraxy, benumbedness, blah, blahs, carelessness, casualness, comatoseness, detachment, disinterest, dispassion, disregard, disregardfulness, dullness, easygoingness, heartlessness, hebetude, heedlessness, hopelessness, inappetence, inattention, incuriosity, indifference, indiscrimination, inexcitability, insouciance, lack of affect, lack of appetite, lackadaisicalness, languidness, lethargicalness, lethargy, listlessness, mindlessness, negligence, numbness, offhandedness, passiveness, passivity, phlegm, phlegmaticalness, phlegmaticness, plucklessness, pococurantism, recklessness, regardlessness, resignation, resignedness, sloth, sluggishness, sopor, soporifousness, spiritlessness, spunklessness, stupefaction, stupor, supineness, torpidity, torpidness, torpor, unanxiousness, unconcern, unmindfulness, unsolicitousness, withdrawnness