knowing vs rigorous

knowing

adj
  • Shrewd or showing clever awareness; discerning. 

  • The ability to know something without being taught. 

  • Suggestive of private knowledge or understanding. 

  • Possessing knowledge or understanding; knowledgeable, intelligent. 

  • Deliberate, wilful. 

  • Demonstrating knowledge of what is in fashion; stylish, chic. 

prep
  • Given my knowledge about someone or something. 

noun
  • The act or condition of having knowledge. 

rigorous

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

  • Severe; intense. 

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