hideous vs sibilant

hideous

adj
  • Having a very unpleasant or frightening sound 

  • Morally offensive; shocking; detestable. 

  • Hateful; shocking. 

  • Extremely or shockingly ugly. 

sibilant

adj
  • Characterized by a hissing or hushing sound such as the s or sh in sack or shack. 

noun
  • A consonant having a hissing or hushing sound such as the s or sh in sack or shack. 

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