boldness vs obstinacy

boldness

noun
  • presumptuousness 

  • The relative weight of a font; the thickness of its strokes. 

  • The state of being bold; courage. 

obstinacy

noun
  • The state, or an act, of stubbornness or doggedness. 

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