boldness vs fortitude

boldness

noun
  • The state of being bold; courage. 

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

  • presumptuousness 

fortitude

noun
  • Mental or emotional strength that enables courage in the face of adversity. 

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