The Collaborative International Dictionary of English v.0.48:

Dysnomy \Dys"no*my\, n. [Gr. ?; dys- ill, bad + ? law.]
   Bad legislation; the enactment of bad laws. --Cockeram.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

DYSNOMY. Bad legislation; the enactment of bad laws.