bravura vs viperish

bravura

adj
  • Overly showy; ostentatious. 

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

  • A display of daring. 

viperish

adj
  • spiteful; treacherous 

  • In the manner of a viper. 

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