Synonyms and related words :
abandon, careless abandon, carelessness, casualness, cursoriness, disregardfulness, easiness, hastiness, heedlessness, inconsiderateness, inconsideration, indifference, insouciance, lack of foresight, laziness, lethe, oblivion, obliviousness, offhandedness, perfunctoriness, recklessness, regardlessness, sprezzatura, tactlessness, thoughtlessness, unaccommodatingness, unheedfulness, unhelpfulness, unmindfulness, unobligingness, unpreparedness, unreadiness, unsolicitousness, unsolicitude, unthinkingness, unthoughtfulness