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):

excessive
    adj 1: beyond normal limits; "excessive charges"; "a book of
           inordinate length"; "his dress stops just short of undue
           elegance"; "unreasonable demands" [syn: excessive,
           inordinate, undue, unreasonable]
    2: unrestrained, especially with regard to feelings;
       "extravagant praise"; "exuberant compliments"; "overweening
       ambition"; "overweening greed" [syn: excessive,
       extravagant, exuberant, overweening]

Moby Thesaurus II by Grady Ward, 1.0:

131 Moby Thesaurus words for "excessive":
   a bit much, abandoned, acute, aggrandized, amplified, ballyhooed,
   bibulous, boundless, cloying, crapulent, crapulous, cutthroat,
   cutting, disgusting, disproportionate, dissipated, dizzy, drastic,
   egregious, enormous, exacting, exaggerated, excess, exorbitant,
   extortionate, extravagant, extreme, fabulous, fancy, fierce,
   fulsome, furious, gigantic, gluttonous, gouging, grandiloquent,
   great, grossly overpriced, high, high-flown, hyperbolic,
   hypertrophied, immoderate, improper, inappropriate, incontinent,
   indulgent, inflated, inflationary, inordinate, intemperate,
   intense, keen, limitless, magnified, monstrous, nauseating,
   out of bounds, out of sight, outrageous, over, overbig, overboard,
   overdeveloped, overdone, overdrawn, overemphasized, overemphatic,
   overestimated, overgreat, overgrown, overindulgent, overindulging,
   overlarge, overmuch, overpraised, overpriced, oversold, overstated,
   overstressed, overweening, overwrought, piercing, preposterous,
   prodigal, profuse, prohibitive, puffed, rigorous, rough,
   self-indulgent, severe, sharp, sky-high, skyrocketing, spiraling,
   splitting, steep, stiff, stretched, super, superfluous,
   superlative, supernatural, swinish, too much, tough, touted,
   towering, unbounded, unbridled, unconscionable, unconstrained,
   uncontrolled, undisciplined, undue, unfrugal, unjustifiable,
   unlimited, unmeasurable, unmeasured, unreasonable, unrestrained,
   untempered, unthrifty, unwarranted, usurious, vehement, venomous,
   violent, virulent