futility vs idleness

futility

noun
  • The quality of being futile or useless. 

  • Something, especially an act, that is futile. 

  • Unimportance. 

idleness

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

  • The state of being idle; inactivity. 

  • The state of being indolent; indolence. 

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