steadfastness vs vacillation

steadfastness

noun
  • Loyalty in the face of trouble and difficulty. 

  • Steadfast resolution. 

vacillation

noun
  • Changing location by moving back and forth. 

  • Indecision in speech or action. 

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