Synonyms: obsess, ghost, haunt
Definition: haunt like a ghost; pursue
Usage: Fear of illness haunts her
Similar words: preoccupy
Definition: engage or engross the interest or attention of beforehand or occupy urgently or obsessively
Usage: His work preoccupies him; The matter preoccupies her completely--she cannot think of anything else
Synonyms: obsess
Definition: be preoccupied with something
Usage: She is obsessing over her weight
Similar words: worry
Definition: be worried, concerned, anxious, troubled, or uneasy
Usage: I worry about my job