feat vs idleness

feat

verb
  • To feature. 

noun
  • A relatively rare or difficult accomplishment. 

idleness

noun
  • Groundlessness; worthlessness; triviality; vanity; frivolity. 

  • The state of being idle; inactivity. 

  • The state of being indolent; indolence. 

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