Source : Webster's Revised Unabridged Dictionary (1913)

Steadiness \Stead"i*ness\, n.
   The quality or state of being steady.

         Steadiness is a point of prudence as well as of
         courage.                                 --L'Estrange.

   Syn: Constancy; resolution; unchangeableness.

Source : WordNet®

steadiness
     n 1: the quality of being steady or securely and immovably fixed
          in place [syn: {firmness}] [ant: {unsteadiness}]
     2: the quality of being steady--regular and unvarying [ant: {unsteadiness}]