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):

excessively
    adv 1: to a degree exceeding normal or proper limits; "too big"
           [syn: excessively, overly, to a fault, too]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "excessively":
   abominably, agonizingly, awfully, baldly, balefully,
   beyond all bounds, bitterly, blatantly, brashly, confoundedly,
   cruelly, damnably, deadly, deathly, deucedly, distressingly,
   dolorously, dreadfully, egregiously, ever, excruciatingly,
   exorbitantly, extortionately, extravagantly, extremely, flagrantly,
   frightfully, gougingly, grievously, grossly, hellishly, high,
   horribly, immensely, immoderately, improperly, inexcusably,
   infernally, inordinately, intemperately, intolerably, lamentably,
   miserably, nakedly, openly, outrageously, over, overfull, overly,
   overmuch, overweeningly, painfully, piteously, preposterously,
   prodigally, sadly, shatteringly, shockingly, something awful,
   something fierce, sorely, staggeringly, terribly, to excess,
   to extremes, too, too much, too-too, torturously, unashamedly,
   unbearably, unconscionably, unduly, unpardonably, unreasonably,
   usuriously, without restraint, woefully