indigestible vs rubbish

indigestible

noun
  • Anything that is difficult to digest. 

adj
  • Difficult or impossible to digest. 

  • Difficult to accept; unpalatable. 

rubbish

noun
  • An item, or items, of low quality. 

  • Nonsense. 

  • Refuse, waste, garbage, junk, trash. 

intj
  • Used to express that what was recently said is nonsense or untrue; balderdash!, nonsense! 

  • Used to express that something is exceedingly bad, awful, or terrible. 

adj
  • Exceedingly bad; awful. 

verb
  • To criticize, to denigrate, to denounce, to disparage. 

  • To litter. 

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