bravura vs dastardly

bravura

adj
  • Overly showy; ostentatious. 

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

  • A display of daring. 

dastardly

adj
  • in the manner of a dastard; marked by cowardice; pusillanimous 

  • treacherous; given to backstabbing 

adv
  • In a cowardly or treacherous fashion. 

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