mischievous vs sly as a fox

mischievous

adj

  • Troublesome, cheeky, badly behaved. 

  • Causing mischief; injurious. 

sly as a fox

adj

  • Very sly, very cunning. 

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