artful vs skulking

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. 

skulking

noun
  • The action of one who skulks. 

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