To inhabit, or visit frequently (most often used in reference to ghosts).
A couple of ghosts haunt the old, burnt-down house.
To make uneasy, restless.
The memory of his past failures haunted him.
To stalk, to follow
The policeman haunted him, following him everywhere.
To live habitually; to stay, to remain.
To accustom; habituate; make accustomed to.
To practise; to devote oneself to.
To persist in staying or visiting.
Of a location, frequented by a ghost or ghosts.
The hotel was haunted by a disembodied spirit.
Obsessed (by an idea, threat, etc.).
a soldier haunted by the memories of combat
Showing a feeling of being disturbed.
a haunted expression