"slaty" in the adjective sense
1. slate-grey, slate-gray, slaty-grey, slaty-gray, slaty, slatey, stone-grey, stone-gray
of the color of slate or granite
"the slaty sky of dawn"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License