slaty

adj

1. Resembling the rock slate.

   “Their faces and hands were yellow as saffron; their small and slaty eyes were set obliquely beneath lashless lids; and their thin lips, which smiled eternally, were crooked. as the blades of scimitars.”

2. Of a light grey colour as slate.

   “But snow had now begun to fall out of a forbiddingly slaty-grey sky, and this seemed to depress both engine and crew.”