hellacious vs sickening

hellacious

adj
  • Remarkable, unbelievable, unusual. 

  • nasty, repellent. 

  • horrible, awful, hellish, agonizing 

sickening

adj
  • Amazing, fantastic. 

  • Causing sickness or disgust. 

noun
  • The act of making somebody sick. 

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