absorbed, daydreaming, dreaming, dreamy, engrossed, faraway, intent, pensive, rapt

heedless, inattentive, insensible, oblivious, unaware, unconscious, unheeding, unknowing, unmindful, unperceptive, unthinking, unwary, unwitting, vacant

befogged, befuddled, bemused, bewildered, birdbrained, clueless, confused, dazed, flighty, foggy, forgetful, forgetting, hazy, muddled, scatterbrained, unfocused (also unfocussed)