foxy vs sly as a fox

foxy

adj
  • Cunning, sly. 

  • Having reddish-brown hair. 

  • Attractive, sexy (of a woman). 

  • Using too much of the reddish-brown colours. 

  • Having the qualities of a fox. 

  • Having an animal-like odour. 

noun
  • The recreational drug 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT). 

sly as a fox

adj
  • Very sly, very cunning. 

How often have the words foxy and sly as a fox occurred in a corpus of books? (source: Google Ngram Viewer )