Source : Webster's Revised Unabridged Dictionary (1913)

Sureness \Sure"ness\, n.
   The state of being sure; certainty.

         For more sureness he repeats it.         --Woodward.

         The law holds with equal sureness for all right action.
                                                  --Emerson.

Source : WordNet®

sureness
     n 1: freedom from doubt; belief in yourself and your abilities;
          "his assurance in his superiority did not make him
          popular"; "after that failure he lost his confidence";
          "she spoke with authority" [syn: {assurance}, {self-assurance},
           {confidence}, {self-confidence}, {authority}]
     2: the quality of being steady and unfailing; "sureness of
        hand"