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Adjective: slaty-gray
Usage: US (elsewhere: slaty-grey)
  1. Of the color of slate or granite
    "the slaty-gray sky of dawn";
    - slate-grey [Brit, Cdn], slate-gray [US], slaty-grey [Brit, Cdn], slaty, slatey, stone-grey [Brit, Cdn], stone-gray [US]

See also: achromatic, neutral