idleness vs indolence

idleness

noun
  • The state of being idle; inactivity. 

  • Groundlessness; worthlessness; triviality; vanity; frivolity. 

  • The state of being indolent; indolence. 

indolence

noun
  • Habitual laziness or sloth. 

  • Lack of pain in a tumour. 

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