bravura vs pertinacious

bravura

adj
  • Overly showy; ostentatious. 

noun
  • A highly technical or difficult piece, usually written for effect. 

  • A display of daring. 

pertinacious

adj
  • Stubbornly resolute or tenacious. 

  • Holding tenaciously to an opinion or purpose. 

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