The Collaborative International Dictionary of English v.0.48:

Insobriety \In`so*bri"e*ty\, n. [Pref. in- not + ?obriety: cf.
   F. insobri['e]t['e].]
   Lack of sobriety, moderation, or calmness; intemperance;
   drunkenness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

insobriety
    n 1: a temporary state resulting from excessive consumption of
         alcohol [syn: drunkenness, inebriation, inebriety,
         intoxication, tipsiness, insobriety] [ant:
         soberness, sobriety]