any disease of the mind; the psychological state of someone who has emotional or behavioral problems serious enough to require psychiatric intervention
engage or engross the interest or attention of beforehand or occupy urgently or obsessively; "His work preoccupies him"; "The matter preoccupies her completely--she cannot think of anything else"
occupy or take possession of beforehand or before another or appropriate for use in advance; "the army preoccupied the hills"
offensively curious or inquisitive; "curious about the neighbor's doings"; "he flipped through my letters in his nosy way"; "prying eyes"; "the snoopy neighbor watched us all day"