frightful vs plaguelike

frightful

adj

  • Genuinely horrific, awful, or alarming. 

  • Unpleasant, dreadful, awful (also used as an intensifier). 

adv

  • Frightfully; very. 

plaguelike

adj

  • Like a plague. 

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