indigestible vs nonedible

indigestible

adj

  • Difficult to accept; unpalatable. 

  • Difficult or impossible to digest. 

noun

  • Anything that is difficult to digest. 

nonedible

adj

  • inedible 

noun

  • inedible 

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