eerie vs unfrightening

eerie

noun
  • An eerie creature or thing. 

adj
  • Strange, weird, fear-inspiring, especially in a shadowy or mysterious way. 

  • Frightened, timid. 

unfrightening

adj
  • Not frightening. 

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