WordNet (r) 3.0 (2006):

too much
    adv 1: more than necessary; "she eats too much"; "let's not
           blame them overmuch" [syn: overmuch, too much]

Moby Thesaurus II by Grady Ward, 1.0:

144 Moby Thesaurus words for "too much":
   a bit much, abandon, abandoned, at the height, at the limit,
   bibulous, boundless, boundlessness, crapulence, crapulency,
   crapulent, crapulous, crapulousness, drunkenness, egregious,
   egregiousness, enormous, enormousness, exaggerated, exaggeration,
   excess, excessive, excessively, excessiveness, exorbitance,
   exorbitancy, exorbitant, exorbitantly, extravagance, extravagancy,
   extravagant, extreme, extremes, extremism, extremity, fabulous,
   fabulousness, fancy, far out, furthest, giantism, gigantic,
   gigantism, gluttonous, gluttony, greatest, high, hyperbole,
   hyperbolic, hypertrophied, hypertrophy, immoderacy, immoderate,
   immoderately, immoderateness, immoderation, incontinence,
   incontinent, indiscipline, indulgence, indulgent, inordinacy,
   inordinance, inordinate, inordinately, inordinateness,
   insufferable, insupportable, intemperance, intemperate,
   intemperately, intemperateness, intolerable, monstrous,
   monstrousness, most, nimiety, out of bounds, out of sight,
   outrageous, outrageously, outrageousness, over, overbig,
   overdeveloped, overdevelopment, overdoing, overgreat,
   overgreatness, overgrown, overgrowth, overindulgence,
   overindulgent, overindulging, overlarge, overlargeness, overly,
   overmuch, overmuchness, overweening, overweeningly, past bearing,
   prodigal, prodigality, radical, radicalism, self-indulgence,
   self-indulgent, steep, stiff, swinish, swinishness, too,
   too-muchness, too-too, ultra, ultra-ultra, unbearable, unbridled,
   unconscionable, unconscionableness, unconscionably, unconstrained,
   unconstraint, uncontrol, uncontrolled, undisciplined, undue,
   undueness, unduly, unendurable, unfrugal, unlimited, unmeasured,
   unreasonable, unreasonableness, unreasonably, unrestrained,
   unrestrainedness, unrestraint, unthrifty, utmost, uttermost,
   way out