Abyssal

Definition:

• (a.) Belonging to, or resembling, an abyss; unfathomable.

Compare abyssal with other words:

abyssal vs. dismal

abyssal vs. pelagic

abysmal vs. abyssal

abyssal vs. plutonic

abyssal vs. crust

abyssal vs. ocean

abyssal vs. unfathomable

abyss vs. abyssal