impugn vs rubbish

impugn

verb
  • To verbally assault, especially to argue against an opinion, motive, or action; to question the truth or validity of. 

rubbish

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

  • To litter. 

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. 

noun
  • Nonsense. 

  • Refuse, waste, garbage, junk, trash. 

  • An item, or items, of low quality. 

adj
  • Exceedingly bad; awful. 

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