unfortunate vs unmitigable

unfortunate

adj
  • marked or accompanied by or resulting in misfortune 

  • not favored by fortune 

noun
  • An unlucky person; one who has fallen into bad circumstances. 

unmitigable

adj
  • Not able to be mitigated or made less severe; not mitigable. 

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