incomparable vs unarguable

incomparable

adj
  • So much better than another as to be beyond comparison; matchless or unsurpassed. 

  • Not able to be compared. 

noun
  • Something beyond compare; a thing with which there is no comparison. 

unarguable

adj
  • Not arguable; that cannot be reasonably argued against. 

noun
  • Such a situation 

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