bravura vs hardened

bravura

adj
  • Overly showy; ostentatious. 

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

  • A display of daring. 

hardened

adj
  • Unfeeling; pitiless; callous. 

  • Inured; toughened. 

  • Firmly established or unlikely to change; inveterate. 

  • Having extra defences against attack; highly fortified. 

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