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Adjective: abysmal  u'biz-mul
  1. Very bad
    "it was an abysmal performance"
  2. Very great; limitless
    "abysmal misery"; "abysmal stupidity"
  3. [literary] Resembling an abyss in depth; so deep as to be unmeasurable
    "the abysmal depths of the ocean";
    - abyssal, unfathomable

See also: deep, immeasurable, immensurable, immensurate, unmeasurable

Encyclopedia: Abysmal