clarity vs weakness

clarity

noun
  • The ability to be easily understood. 

  • The state or measure of being clear, either in appearance, thought or style; lucidity. 

weakness

noun
  • An inadequate quality; fault 

  • The condition of being weak. 

  • A special fondness or desire. 

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