In a dark manner; so as to appear dark; as a dark object or spot.

Blindly; as one deprived of sight; with uncertainty.

Dimly; obscurely; faintly; imperfectly.

Mysteriously; with sinister vagueness: as, it was darkly hinted that murder had been committed.

adverb. With imperfect light, clearness, or knowledge; obscurely; dimly; blindly; uncertainly.

adverb. With a dark, gloomy, cruel, or menacing look.

adverb. To appear as dark.

adverb. mysterious

adverb. Faintly seen in the dark.

adverb. in a dark glowering menacing manner

adverb. without light

"Hungry mice were waiting in darkly camouflaged papers like frozen cars with their headlights on fire."

Barkley  sparkly  starkly  

blindly  dimly  obscurely  uncertainly