haunted vs unconcerned

haunted

adj
  • Of a location, frequented by a ghost or ghosts. 

  • Showing a feeling of being disturbed. 

  • Obsessed (by an idea, threat, etc.). 

unconcerned

adj
  • Not anxious, apprehensive, or worried. 

  • Having no involvement. 

  • Indifferent and having no interest; aloof. 

How often have the words haunted and unconcerned occurred in a corpus of books? (source: Google Ngram Viewer )