enervation vs idleness

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

idleness

noun
  • The state of being indolent; indolence. 

  • Groundlessness; worthlessness; triviality; vanity; frivolity. 

  • The state of being idle; inactivity. 

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