abyss
n//æˈbɪs//avgrund, bråddjup, djup, hjärtplats
Hell; the bottomless pit; primeval chaos; a confined subterranean ocean. [First attested around 1350 to 1470.]
Moral depravity; vast intellectual or moral depth.
(frequently, figurative) A bottomless or unfathomed depth, gulf, or chasm; hence, any deep, immeasurable; any void space. [First attested in the late 16th century.]
(heraldry) The center of an escutcheon; fess point.