gainsaying vs unaffirmative

gainsaying

noun
  • Denial; denying. 

  • Rebellious opposition; rebellion. 

  • Refusal to accept or believe something. 

  • Contradiction. 

  • Opposition, especially in speech. 

unaffirmative

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