(n.) Freedom from passion; an undisturbed state; apathy.

Olympian detachment abnegation abstinence accidia acedia aloofness anesthesia apathy ataraxia ataraxy autism benumbedness blah blahs bovinity calm calmness carelessness casualness catatonia chill chilliness cold blood cold heart coldheartedness coldness comatoseness conservatism constraint continence control cool coolness deadpan detachment disinterest disinterestedness dispassionateness disregard disregardfulness dullness easy temper easygoingness emotional deadness emotionlessness even temper evenness frigidity frostiness gentleness golden mean good temper happy medium heartlessness hebetude heedlessness hopelessness iciness immovability impartiality impassibility impassiveness impassivity imperturbability imperturbableness inappetence inattention incuriosity indifference indiscrimination inexcitability inexcitableness inirritability insouciance judiciousness juste-milieu lack of affect lack of appetite lack of feeling lack of touch lackadaisicalness languidness lenity lethargicalness lethargy listlessness loftiness meden agan middle way mildness mindlessness moderateness moderation moderationism negligence neutrality nonchalance nonviolence nothing in excess numbness objectivity obtuseness pacifism passionlessness passiveness passivity patience phlegm phlegmaticalness phlegmaticness plucklessness pococurantism poker face prudence recklessness regardlessness repose resignation resignedness restraint self-abnegation self-absorption self-control self-denial self-restraint selflessness serenity sloth sluggishness smooth temper sobriety sopor soporifousness soullessness spiritlessness spunklessness stability steadiness stoicism stolidity straight face stupefaction stupor supineness temperance temperateness torpidity torpidness torpor tranquillity unanxiousness unbias unbiasedness unconcern unemotionalism unexcessiveness unexcitability unextravagance unextremeness unfeeling unfeelingness unimpressibility unimpressionableness unirritableness unmindfulness unnervousness unpassionateness unresponsiveness unselfishness unsolicitousness unsusceptibility unsympatheticness untouchability via media withdrawal withdrawnness