(n.) Want of concern; absence of anxiety; freedom from solicitude; indifference.

accidia acedia aloofness apathy ataraxia ataraxy benumbedness blah blahs boredom carelessness casualness comatoseness detachment disinterest disinterestedness dispassion disregard disregardfulness dullness easygoingness heartlessness hebetude heedlessness hopelessness impassiveness impassivity inappetence inattention incuriosity incuriousness indifference indifferentism indifferentness indiscrimination inexcitability insouciance intellectual inertia lack of affect lack of appetite lack of interest lackadaisicalness languidness lassitude lethargicalness lethargy listlessness mindlessness negligence nonchalance numbness offhandedness passiveness passivity phlegm phlegmaticalness phlegmaticness plucklessness pococurantism recklessness regardlessness resignation resignedness sloth sluggishness sopor soporifousness spiritlessness spunklessness stolidity stupefaction stupor supineness torpidity torpidness torpor unanxiousness uninquisitiveness uninterestedness unmindfulness unsolicitousness withdrawal withdrawnness