negatory vs treacherous

negatory

adj

  • Negative, negating. 

noun

  • No. 

treacherous

adj

  • Deceitful; inclined to betray. 

  • Unreliable; dangerous. 

  • Exhibiting treachery. 

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