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Adjective: unplumbed  ,ún'plúmd
  1. Situated at or extending to great depth; too deep to have been sounded or plumbed
    "unplumbed depths of the sea";
    - profound, unfathomed, unsounded
     
  2. (construction) not fitted with plumbing
    "The cabin remained unplumbed until modern utilities arrived"

See also: deep