A dusky shark.
A dusky dolphin.
A dusky grouse.
Dimly lit, as at dusk (evening).
I like it when it is dusky, just before the street lights come on.
Having a shade of color that is rather dark.
The dusky rose was of a muted color, not clashing with any of the other colors.
Dark-skinned.
Ashen; having a greyish skin coloration.
The patient was in shock and had a dusky skin tone.