abysmal

Adjective
  1. Very great;
    Limitless (synset 301502652)
    "abysmal misery"; "abysmal stupidity"
    similar to: immeasurable, immensurable, unmeasurable - impossible to measure
  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: abyssal, unfathomable

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