exhaustion vs weariness

exhaustion

noun
  • Supreme tiredness; having exhausted energy. 

  • An exhaustive procedure 

  • The point of complete depletion, of the state of being used up. 

weariness

noun
  • Exhaustion, fatigue or tiredness. 

  • A lack of interest or excitement. 

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