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

See also: deep, incomprehensible, uncomprehensible, unsoundable

Antonym: fathomable