aggravating circumstance vs unpleasantness

aggravating circumstance

noun
  • A factor that increases the culpability or deleterious consequences of a wrongful act. 

unpleasantness

noun
  • The property of being unpleasant or disagreeable. 

  • An unpleasant behaviour, occurrence, etc. 

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