Titanic vs gruelling

Titanic

adj
  • Of a conflict or contest: involving equally powerful participants. 

  • Of or relating to the Titans, a race of giant gods in Greek mythology. 

  • Having great size, or great force, power, or strength. 

name
  • The R.M.S. Titanic, an ocean liner, supposedly unsinkable, that sank on its maiden voyage on 15 April 1912 after colliding with an iceberg. 

noun
  • A venture that fails spectacularly, especially one perceived as overconfident. 

gruelling

adj
  • So difficult or taxing as to make one exhausted; backbreaking. 

noun
  • A gruelling ordeal. 

  • A race in which the animal being raced finishes in a state of physical exhaustion. 

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