Lethean a stranger to absentminded airy aloof amnestic apathetic asleep ataractic blase blind to blocked bored careless casual caught napping converted cursory dead to deaf to degage detached devil-may-care disinterested dispassionate disregardant disregardful distant distracted distrait easygoing flippant forgetful forgetting free and easy heedless impassive impercipient in ignorance of inadvertent inattentive inclined to forget incognizant inconsiderate incurious indifferent inexcitable inobservant insensible insensible to insouciant lackadaisical lazy listless mindless napping negligent nonchalant nonconceiving not with it oblivious offhand out of it perfunctory phlegmatic pococurante reckless regardless repressed respectless stolid suppressed tactless thankless thoughtless turned-off unaccommodating unanxious unappreciative unaware unaware of uncomplaisant unconcerned unconscious unconscious of uncooperative undiplomatic undiscriminating ungrateful unhearing unheedful unheeding unhelpful uninquiring uninsightful uninterested uninvolved unknowing unmarking unmindful of unnoticing unnoting unobliging unobservant unobserving unperceiving unprehensive unprepared unready unrealizing unremarking unseeing unsolicitous unsuspecting untactful unthankful unthinking unthoughtful unwitting withdrawn witless