artful vs smooth operator

artful

adj
  • Not naturally produced; artificial; imitative. 

  • Characterized by, or performed with, cleverness or contrivance; clever, ingenious. 

  • Skilful at using dishonest or unfair means to achieve a purpose; crafty, cunning. 

  • Exhibiting or using much art or skill; dexterous; skilful. 

smooth operator

noun
  • A person who accomplishes tasks with efficiency and grace, especially one with verbal skills who is persuasive in interpersonal relationships, negotiation, etc. 

  • A skillful, manipulative person, con artist, or clever scoundrel. 

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