1. having or showing excessive or compulsive concern with something

e.g. 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

Synonym: hauntedpreoccupiedtaken up(p)

2. influenced or controlled by a powerful force such as a strong emotion

e.g. by love possessed

Synonym: possessed(p)