The Hadean eon; part of the Precambrian supereon, spanning from around 4.6 to 4 billion years ago.
Pertaining to Hades or hell.
Of, or relating to the geological eon.
A dusky dolphin.
A dusky grouse.
A dusky shark.
Ashen; having a greyish skin coloration.
Dimly lit, as at dusk (evening).
Having a shade of color that is rather dark.