indigestible vs unconsumable

indigestible

adj

  • Difficult or impossible to digest. 

  • Difficult to accept; unpalatable. 

noun

  • Anything that is difficult to digest. 

unconsumable

adj

  • Not able to be consumed. 

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