Synonyms and related words :
Lethean, absentminded, airy, aloof, amnestic, apathetic, arbitrary, ataractic, blase, blind, blocked, bored, capricious, careless, casual, converted, cursory, deaf, degage, detached, devil-may-care, disinterested, dispassionate, disregardant, disregardful, distant, distracted, distrait, easygoing, feckless, flippant, forgetful, forgetting, free and easy, grasshopper, happy-go-lucky, impassive, improvident, inadvertent, inattentive, inclined to forget, inconsiderate, incurious, indifferent, inexcitable, inobservant, insouciant, lackadaisical, lazy, listless, mindless, neglectful, negligent, nonchalant, oblivious, offhand, perfunctory, phlegmatic, pococurante, reasonless, reckless, regardless, repressed, respectless, shiftless, stolid, suppressed, tactless, thoughtless, thriftless, turned-off, unaccommodating, unanxious, uncalculating, uncaring, uncomplaisant, unconcerned, uncooperative, undiplomatic, undiscriminating, uneconomical, unguarded, unheedful, unheeding, unhelpful, uninquiring, uninterested, uninvolved, unmarking, unmindful, unnoticing, unnoting, unobliging, unobservant, unobserving, unprepared, unproviding, unready, unreasoning, unreflecting, unreflective, unremarking, unsolicitous, untactful, unthinking, unthoughtful, unthrifty, withdrawn, wrecking