Synonyms and related words :
Lethean, absent, absent-minded, absentminded, abstracted, airy, amnesiac, amnestic, bemused, blocked, careless, casual, converted, cursory, degage, disregardant, disregardful, distracted, dreaming, dreamy, easygoing, flippant, forgetting, free and easy, heedless, in the clouds, inattentive, inclined to forget, inconsiderate, indifferent, insouciant, lax, lazy, mindless, neglectful, negligent, oblivious, offhand, out of it, perfunctory, preoccupied, reckless, regardless, remiss, remote, repressed, respectless, slack, suppressed, tactless, thoughtless, unaccommodating, uncomplaisant, uncooperative, undiplomatic, unheedful, unheeding, unhelpful, unmindful, unobliging, unprepared, unready, unsolicitous, untactful, unthinking, unthoughtful, unwitting