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Adjective: unsounded  ,ún'sawn-did
  1. Situated at or extending to great depth; too deep to have been sounded or plumbed
    "remote and unsounded caverns";
    - profound, unfathomed, unplumbed
  2. Not made to sound
    "in French certain letters are often unsounded";
    - silent

See also: deep, inaudible, unhearable