(n.) Carelessness; heedlessness; thoughtlessness; unconcern.

abandon accidia acedia aloofness apathy ataraxia ataraxy benumbedness blah blahs boredom careless abandon carelessness casualness comatoseness cursoriness detachment disinterest disinterestedness dispassion disregard disregardfulness dullness easiness easygoingness forgetfulness hastiness heartlessness hebetude heedlessness hopelessness impassiveness impassivity inappetence inattention inconsiderateness inconsideration incuriosity incuriousness indifference indifferentism indifferentness indiscrimination inexcitability intellectual inertia lack of affect lack of appetite lack of foresight lack of interest lackadaisicalness languidness lassitude laziness lethargicalness lethargy listlessness mindlessness negligence nonchalance numbness oblivion offhandedness passiveness passivity perfunctoriness phlegm phlegmaticalness phlegmaticness plucklessness pococurantism recklessness regardlessness resignation resignedness sloth sluggishness sopor soporifousness spiritlessness sprezzatura spunklessness stolidity stupefaction stupor supineness tactlessness thoughtlessness torpidity torpidness torpor unanxiousness unconcern unheedfulness uninquisitiveness uninterestedness unmindfulness unpreparedness unreadiness unsolicitousness unsolicitude unthinkingness withdrawal withdrawnness