abyssal

/ษ™หˆbษชs.lฬฉ/

IPA: /AH0 B IH1 S AH0 L/

adjective
  1. 1

    Belonging to, or resembling, an abyss; unfathomable.

  2. 2

    Of or belonging to the ocean depths, especially below 2000 metres (6500 ft): abyssal zone.

  3. 3

    Pertaining to or occurring at excessive depths in the earth's crust; plutonic.

Source: https://en.wiktionary.org/wiki/abyssal