backstair vs sensitive

backstair

adj
  • clandestine, secret or furtive 

noun
  • The backstairs (stairs at the rear of a building). 

sensitive

adj
  • Meant to be concealed or kept secret. 

  • Having the faculty of sensation; pertaining to the senses. 

  • Responsive to stimuli. 

  • Easily offended, upset, or hurt. 

  • Important, intricate, and requiring great delicacy. 

  • Capable of offending, upsetting, or hurting. 

  • Accurate; able to register small changes in some property. 

noun
  • A person with a paranormal sensitivity to something that most cannot perceive. 

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