sagacity vs unsoundness

sagacity

noun
  • See Thesaurus:wisdom 

  • The quality of being sage, wise, or able to make good decisions; the quality of being perceptive, astute or insightful. 

unsoundness

noun
  • The state of being unsound. 

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