(a.) Having black eyebrows. Hence: Gloomy; dismal; threatening; forbidding.

beetle beetling black black-browed dark dejected dour dumpish frowning glowering glum grim grum impendent impending incumbent jutting lowering melancholy moodish moody mopey moping mopish morose mumpish overhanging overhung pending projecting scowling sulky sullen superincumbent surly