double-dealing vs speciousness

double-dealing

noun

  • deceit or treachery 

adj

  • Cheating, dishonest; treacherous. 

speciousness

noun

  • The result or product of being specious. 

  • The state or quality of being specious. 

How often have the words double-dealing and speciousness occurred in a corpus of books? (source: Google Ngram Viewer )