abyssal
adjectiveUK /əˈbɪs.əl/
US /əˈbɪs.əl/
Something abyssal is so deep it feels like it has no bottom.
The submarine dove into the abyssal darkness of the ocean.
OTHER MEANINGS
2. Relating to the deepest parts of the ocean, far below the surface.
Abyssal creatures live in permanent darkness.
3. Extremely bad or hopeless, like a situation with no way out.
After the crash, the team's mood was abyssal.
4. Very great in size or degree, like a huge gap.
There was an abyssal difference between the two plans.