ductile vs unbending

ductile

adj
  • Led easily; prone to follow. 

  • Capable of being pulled or stretched into thin wire by mechanical force without breaking. 

  • Molded easily into a new form. 

unbending

adj
  • inflexible and not yielding 

  • very reserved, aloof and asocial 

noun
  • The act of one who unbends. 

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