unbeaten vs worst

unbeaten

adj
  • Not beaten or whisked 

  • not having been thrashed or beaten 

  • not defeated 

  • not out 

  • untrodden 

worst

noun
  • Something or someone that is the worst. 

verb
  • To outdo or defeat, especially in battle. 

adj
  • Most unfavorable. 

  • Used with the definite article and an implied noun: something that is worst. 

  • Most inferior; doing the least good. 

  • Most harmful or severe. 

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