concuss vs dastardize

concuss

verb
  • To force to do something, or give up something, by intimidation; to coerce. 

  • To injure the brain of, usually temporarily, by violent impact. 

dastardize

verb
  • To make cowardly; to intimidate or dispirit. 

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