unbeaten vs unkillable

unbeaten

adj
  • not defeated 

  • Not beaten or whisked 

  • not having been thrashed or beaten 

  • not out 

  • untrodden 

unkillable

adj
  • Not killable; unable to be killed. 

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