Mephistophelian vs ghastly

Mephistophelian

ghastly

adv
  • In a ghastly manner. 

adj
  • Like a ghost in appearance; death-like; pale; pallid; dismal. 

  • Horrifyingly shocking. 

  • Extremely bad. 

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