acuity vs folly

acuity

noun
  • Sharpness or acuteness, as of a needle, wit, etc. 

  • The ability to think, see, or hear clearly. 

folly

noun
  • Foolishness that results from a lack of foresight or lack of practicality. 

  • a pinkish-red color 

  • A fanciful building built for purely ornamental reasons. 

  • Thoughtless action resulting in tragic consequence. 

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