Hadean

[hey-deez] /ˈheɪ diz/

noun
1.
Classical Mythology.

2.
(in the Revised Version of the New Testament) the abode or state of the dead.
3.
(often lowercase) .
/ˈheɪdiːz/
noun
1.
(Greek myth)

2.
(New Testament) the abode or state of the dead
3.
(often not capital) (informal) hell

1590s, from Greek Haides, in Homer the name of the god of the underworld, of unknown origin. Perhaps literally “the invisible” [Watkins]. The name of the god transferred in later Greek writing to his kingdom. Related: Hadal (adj.), 1964; Hadean.
Hades

[Roman name Pluto]

The Greek and Roman god of the underworld and the ruler of the dead. Also called Dis. The underworld itself was also known to the Greeks as Hades.

Note: The Greek and Roman underworld later became associated with the hell of Christianity, as in the expression “hot as Hades.”

that which is out of sight, a Greek word used to denote the state or place of the dead. All the dead alike go into this place. To be buried, to go down to the grave, to descend into hades, are equivalent expressions. In the LXX. this word is the usual rendering of the Hebrew sheol, the common receptacle of the departed (Gen. 42:38; Ps. 139:8; Hos. 13:14; Isa. 14:9). This term is of comparatively rare occurrence in the Greek New Testament. Our Lord speaks of Capernaum as being “brought down to hell” (hades), i.e., simply to the lowest debasement, (Matt. 11:23). It is contemplated as a kind of kingdom which could never overturn the foundation of Christ’s kingdom (16:18), i.e., Christ’s church can never die. In Luke 16:23 it is most distinctly associated with the doom and misery of the lost. In Acts 2:27-31 Peter quotes the LXX. version of Ps. 16:8-11, plainly for the purpose of proving our Lord’s resurrection from the dead. David was left in the place of the dead, and his body saw corruption. Not so with Christ. According to ancient prophecy (Ps. 30:3) he was recalled to life.