lithe vs unyielding

lithe

noun
  • Shelter. 

verb
  • To listen to, hearken to. 

adj
  • Adaptable. 

  • Slim but not skinny. 

  • Capable of being easily bent; flexible. 

unyielding

adj
  • Not giving in; not bending; stubborn. 

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