fatuousness vs sagacity

fatuousness

noun
  • Something fatuous; a stupid idea or utterance. 

  • The characteristic of being fatuous. 

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. 

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