laxity vs unenthusiasm

laxity

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

  • Moral looseness; lack of rigorousness or strictness. 

unenthusiasm

noun
  • Lack of enthusiasm. 

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