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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 [literary], abyssal
  3. Incapable of being fully understood

See also: deep, incomprehensible, uncomprehensible, unsoundable

Antonym: soundable