hideous vs unattractive

hideous

adj
  • Extremely or shockingly ugly. 

  • Morally offensive; shocking; detestable. 

  • Hateful; shocking. 

  • Having a very unpleasant or frightening sound 

unattractive

adj
  • Not handsome or beautiful or appealing. 

  • Lacking the power to attract interest. 

noun
  • An aesthetically unattractive person 

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