foreboding vs unfun

foreboding

noun
  • An evil omen. 

  • A sense of evil to come. 

adj
  • Of ominous significance; serving as an ill omen; foretelling of harm or difficulty. 

unfun

noun
  • Lack or absence of fun; funlessness. 

adj
  • Not fun. 

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