silky vs unslippery

silky

adj
  • Covered in long, slender, glistening hairs pressed close to the surface; sericeous. 

  • Similar in appearance or texture (especially in softness and smoothness) to silk. 

  • Smooth and pleasant; seductive. 

unslippery

adj
  • Not slippery. 

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