extortionate vs unreasonable

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”). 

unreasonable

adj
  • Not reasonable; going beyond what could be expected or asked for. 

  • Without the ability to reason; unreasoning. 

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