flexible vs impassible

flexible

adj
  • Capable of being flexed or bent without breaking; able to be turned or twisted without breaking. 

  • Capable or being adapted or molded in some way. 

  • Willing or prone to give way to the influence of others; not invincibly rigid or obstinate. 

noun
  • Something that is flexible. 

impassible

adj
  • Incapable of suffering injury or detriment. 

  • Unable to feel emotion; impassive. 

  • Unable to suffer, or feel pain. 

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