crushing vs rigorous

crushing

adj
  • Devastatingly disheartening. 

  • That crushes; overwhelming. 

noun
  • The act of subjecting sugarcane to crushing. 

  • The action of the verb to crush. 

  • Crushed material. 

  • A former method of execution by placing heavy weights on the victim. 

rigorous

adj
  • Severe; intense. 

  • Showing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough. 

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