extortionate vs unconscionable

extortionate

adj
  • Greatly exceeding what is moderate or reasonable; exorbitant. 

  • Of, related to, or typifying extortion (“the practice of obtaining money or other property by the use of force or threats”). 

unconscionable

adj
  • Excessive, imprudent or unreasonable. 

  • Not conscionable; unscrupulous and lacking principles or conscience. 

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