abyss

[uh-bis] /əˈbɪs/
noun
1.
a deep, immeasurable space, gulf, or cavity; vast chasm.
2.
anything profound, unfathomable, or infinite:
the abyss of time.
3.
  1. the primal chaos before Creation.
  2. the infernal regions; hell.
  3. a subterranean ocean.
Origin
1350-1400; earlier abisse, Middle English abissus < Late Latin abyssus < Greek ábyssos bottomless, equivalent to a- a-6 + byssós bottom of the sea

Abyss.

Examples from the web for abyss
  • From there, it plunges down well over a mile into the deep blue abyss.
  • But then it slipped into the deep tablet abyss, ne'er to be seen again.
  • They didn't have a clue how deep the abyss would go.
  • It is not a gap, it is an abyss.
  • By the end, they had been stomped on by giant robots and kicked into a flaming abyss.
  • These chillingly realized glimpses of the abyss are not for the faint of heart.
  • If any culture can pull themselves up and out of "the abyss" it is a certainty in my mind that they will.
  • I've gone on some fruitless adventures into the abyss.
  • Andrew stepped back from the abyss last week with a welcome change from a series of abysmal appearances.
  • We are able, somehow, to communicate through the abyss regardless.
British Dictionary definitions for abyss

abyss

/əˈbɪs/
noun
1.
a very deep or unfathomable gorge or chasm
2.
anything that appears to be endless or immeasurably deep, such as time, despair, or shame
3.
hell or the infernal regions conceived of as a bottomless pit
Word Origin
C16: via Late Latin from Greek abussos bottomless (as in the phrase abussos limnē bottomless lake), from a-1 + bussos depth
Word Origin and History for abyss
n.

late 14c., earlier abime (c.1300, from a form in Old French), from Late Latin abyssus "bottomless pit," from Greek abyssos (limne) "bottomless (pool)," from a- "without" (see a- (2)) + byssos "bottom," possibly related to bathos "depth."