Main entry: haunted, preoccupied, taken up, obsessed
Definition: having or showing excessive or compulsive concern with something
Usage: became more and more haunted by the stupid riddle; was absolutely obsessed with the girl; got no help from his wife who was preoccupied with the children; he was taken up in worry for the old woman
Main entry: preoccupied, bemused, deep in thought, lost
Definition: deeply absorbed in thought
Usage: as distant and bemused as a professor listening to the prattling of his freshman class; lost in thought; a preoccupied frown