malady vs weakness

malady

noun
  • A moral or mental defect or disorder. 

  • Any ailment or disease of the body; especially, a lingering or deep-seated disorder. 

weakness

noun
  • A special fondness or desire. 

  • An inadequate quality; fault 

  • The condition of being weak. 

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