bemused, deep in thought, lost, preoccupied -- (deeply absorbed in thought; "as distant and bemused as a professor listening to the prattling of his freshman class"; "lost in thought"; "a preoccupied frown")
baffled, befuddled, bemused, bewildered, confounded, confused, lost, mazed, mixed-up, at sea -- (perplexed by many conflicting situations or statements; filled with bewilderment; "obviously bemused by his questions"; "bewildered and confused"; "a cloudy and confounded philosopher"; "just a mixed-up kid"; "she felt lost on the first day of school")