intimidating vs ominous

intimidating

adj
  • Threatening, producing feelings of fear or timidity. 

ominous

adj
  • Specifically, giving indication of a coming ill; being an evil omen 

  • Of or pertaining to an omen or to omens; being or exhibiting an omen; significant. 

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