: in a dark manner: such as
b
: with dimmed or obscured vision : dimly
seeing a ship but darkly against the horizon
c
: with a dark or blackish color
the storm clouds gathered darkly
d
: with a dark, gloomy, or menacing look or manner
glancing darkly at his opponent
e
: in the dark : secretly
thoughts held darkly in his mind
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Merriam-Webster unabridged