"darkly : With a dark appearance. Faintly seen in the dark. (figuratively) In a morbid manner;..."

“darkly : With a dark appearance.
Faintly seen in the dark.
(figuratively) In a morbid manner; morbidly, sinisterly.
(figuratively) Mysteriously; forebodingly, ominously.”

- https://en.wiktionary.org/wiki/darkly#English

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