ETYM Latin abyssus a bottomless gulf, from Greek for bottomless; a priv. + byssos depth, bottom.
(Irregular plural: abysses).
A bottomless gulf or pit; SYN. abysm.
Any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)
Gouffre.
1. Cavité.
2. Caverne.
3. Précipice.
4. Cause de ruine. Ce projet est un gouffre financier.