inexertion vs laxity

inexertion

noun
  • Lack of exertion or effort; indolence; laziness. 

laxity

noun
  • The state of being lax; looseness, lack of tension. 

  • Moral looseness; lack of rigorousness or strictness. 

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