sturdy vs yielding

sturdy

noun
  • A disease caused by a coenurus infestation in the brain of an animal, especially a sheep or canid; coenurosis. 

adj
  • Resolute, in a good sense; or firm, unyielding quality. 

  • Of firm build; stiff; stout; strong. 

  • Solid in structure or person. 

yielding

adj
  • Docile, or inclined to give way to pressure. 

noun
  • A concession. 

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