(as) black as the devil

1. dated Completely black; totally without light or color. The basement gives me the creeps, it's as black as the devil down there! Is this meatloaf supposed to be black as the devil? How long did you cook it for? My hands were black as the devil after working on that filthy engine all day.

2. dated Of a thoroughly evil, mean-spirited, or ungenerous mindset or disposition. Looking into his eyes, I saw his heart was as black as the devil. Whoever masterminded this heinous prank must be black as the devil. Looking into his eyes, I saw his heart was as black as the devil.