disastrous vs unfortunate

disastrous

adj
  • Foreboding disaster; ill-omened. 

  • Of the nature of a disaster; calamitous. 

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. 

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