indigestible vs nefariousness

indigestible

noun

  • Anything that is difficult to digest. 

adj

  • Difficult or impossible to digest. 

  • Difficult to accept; unpalatable. 

nefariousness

noun

  • The state or characteristic of being nefarious. 

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