Source : Webster's Revised Unabridged Dictionary (1913)

Passiveness \Pas"sive*ness\, n.
   The quality or state of being passive; unresisting
   submission.

         To be an effect implies passiveness, or the being
         subject to the power and action of its cause. --J.
                                                  Edwards.

Source : WordNet®

passiveness
     n 1: submission to others or to outside influences [syn: {passivity}]
     2: the trait of remaining inactive; a lack of initiative [syn:
        {passivity}]