Synonyms and related words :
absentmindedness, accidia, acedia, apathy, ataraxia, ataraxy, carelessness, casualness, detachment, disinterest, dispassion, disregard, disregardfulness, distraction, easygoingness, flightiness, flippancy, frivolousness, giddiness, heedlessness, inadvertence, inadvertency, inattention, inattentiveness, inconsideration, indifference, indiscrimination, inexcitability, inobservance, insouciance, lack of affect, lackadaisicalness, levity, lightmindedness, listlessness, mindlessness, negligence, nonchalance, nonobservance, obliviousness, pococurantism, recklessness, regardlessness, shallowness, sloth, superficiality, thoughtlessness, unalertness, unanxiousness, unawareness, unconcern, unconsciousness, unheedfulness, unintentiveness, unmindfulness, unobservance, unsolicitousness, unwariness, unwatchfulness