ailing vs indigestible

ailing

noun

  • An ailment. 

adj

  • Sickly; sick; ill; unwell. 

indigestible

noun

  • Anything that is difficult to digest. 

adj

  • Difficult or impossible to digest. 

  • Difficult to accept; unpalatable. 

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