The Collaborative International Dictionary of English v.0.48:

Immoderation \Im*mod`er*a"tion\, n. [L. immoderatio: cf. F.
   imod['e]ration.]
   Lack of moderation. --Hallywell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

immoderation
    n 1: the quality of being excessive and lacking in moderation
         [syn: immoderation, immoderateness] [ant:
         moderateness, moderation]