The Collaborative International Dictionary of English v.0.48:

Excessive \Ex*cess"ive\ ([e^]k*s[e^]s"[i^]v), a. [Cf. F.
   excessif.]
   Characterized by, or exhibiting, excess; overmuch.
   [1913 Webster]

         Excessive grief [is] the enemy to the living. --Shak.

   Syn: Undue; exorbitant; extreme; overmuch; enormous;
        immoderate; monstrous; intemperate; unreasonable. See
        Enormous --Ex*cess*ive*ly, adv. -Ex*cess"ive*ness,
        n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

excessiveness
    n 1: immoderation as a consequence of going beyond sufficient or
         permitted limits [syn: excess, excessiveness,
         inordinateness]