idleness vs leadenness

idleness

noun
  • The state of being indolent; indolence. 

  • Groundlessness; worthlessness; triviality; vanity; frivolity. 

  • The state of being idle; inactivity. 

leadenness

noun
  • The quality of being leaden. 

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