hideous vs plug-ugly

hideous

adj
  • Extremely or shockingly ugly. 

  • Morally offensive; shocking; detestable. 

  • Hateful; shocking. 

  • Having a very unpleasant or frightening sound 

plug-ugly

adj
  • Very ugly. 

noun
  • An ugly person. 

  • A member of an American nativist street gang that operated in the west side of Baltimore, Maryland, from 1854 to 1865. 

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