indigestible vs the pits

indigestible

noun

  • Anything that is difficult to digest. 

adj

  • Difficult or impossible to digest. 

  • Difficult to accept; unpalatable. 

the pits

noun

  • Something miserable or unpleasant. 

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