hardiness vs weakness

hardiness

noun
  • The quality of being able to withstand fatigue and hardship; (of a plant) the quality of being resistant to cold or other environmental conditions. 

weakness

noun
  • An inadequate quality; fault 

  • The condition of being weak. 

  • A special fondness or desire. 

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