Etymology
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darkly (adv.)

Old English deorclice "in a (morally) dark manner, horribly, foully;" see dark + -ly (2). Meaning "mysteriously, with (often sinister) vagueness" is from late 14c.; that of "dimly, obscurely, faintly" is from early 15c.; that of "gloomily, ominously" is from 1590s.

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Definitions of darkly

darkly (adv.)
without light;
the river was sliding darkly under the mist
Synonyms: in darkness
darkly (adv.)
in a dark glowering menacing manner;
he stared darkly at her
From wordnet.princeton.edu