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Adjective: unfathomable  `ún'fa-dhu-mu-bul
  1. Of depth; not capable of being sounded or measured
     
  2. Resembling an abyss in depth; so deep as to be unmeasurable
    "the unfathomable depths of the ocean"
    - abysmal, abyssal
     
  3. Impossible to come to understand

See also: deep, incomprehensible, uncomprehensible, unsoundable

Antonym: fathomable