Pertaining to Hades or hell.
Of, or relating to the geological eon.
The Hadean eon; part of the Precambrian supereon, spanning from around 4.6 to 4 billion years ago.
Suffering from gloom; melancholy; dejected.
Not very illuminated; dim because of darkness, especially when appearing depressing or frightening.
Someone or something that is gloomy or pessimistic.