haunting vs indelible

haunting

adj
  • Remaining in the mind; not easily forgotten. 

noun
  • A particular instance of haunting; a ghostly habitation. 

indelible

adj
  • Incapable of being canceled, lost, or forgotten. 

  • Having the quality of being difficult to delete, remove, wash away, blot out, or efface. 

  • Incapable of being annulled. 

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