laxity vs sluggishness

laxity

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

  • Moral looseness; lack of rigorousness or strictness. 

sluggishness

noun
  • The property of being sluggish, unable or unwilling to act quickly. 

  • The state of economic decline, inactivity, slow or subnormal growth. 

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