From The Collaborative International Dictionary of English v.0.48:

Unturned \Un*turned"\, a. [Pref. un- + turned.]
   Not turned; not revolved or reversed.
   [1913 Webster]

   To leave no stone unturned, to leave nothing untried for
      accomplishing one's purpose.
      [1913 Webster]

            [He] left unturned no stone
            To make my guilt appear, and hide his own. --Dryden.
      [1913 Webster]
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