boldness vs unobtrusiveness

boldness

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

  • The state of being bold; courage. 

  • presumptuousness 

unobtrusiveness

noun
  • The state of being unobtrusive. 

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