abyssal

Adjective
  1. Relating to ocean depths from 2000 to 5000 meters (synset 302985278)
  2. Resembling an abyss in depth;
    So deep as to be unmeasurable (synset 300693960)
    "the abyssal depths of the ocean"
    similar to: deep - having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination
    same as: abysmal, unfathomable

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