catastrophic vs unlucky

catastrophic

adj
  • Disastrous; ruinous. 

  • From which recovery is impossible. 

  • Of or pertaining to a catastrophe. 

unlucky

adj
  • Unfortunate, marked by misfortune. 

  • Having ill luck. 

  • Inauspicious. 

  • Bringing ill luck. 

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