The Collaborative International Dictionary of English v.0.48:

Draconian \Dra*co"ni*an\, a.
   Pertaining to Draco, a famous lawgiver of Athens, 621 b. c.
   Used especially in the phrase Draconian punishment.
   [1913 Webster +PJC]

   Draconian code, or Draconian laws, a code of laws made by
      Draco. Their measures were so severe that they were said
      to be written in letters of blood; hence, any laws of
      excessive rigor.

   Draconian punishment, punishment so severe as to seem
      excessive for the crime being punished.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Draconian
    adj 1: of or relating to Draco or his harsh code of laws;
           "Draconian measures"

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "Draconian":
   Tartarean, animal, anthropophagous, atrocious, barbaric, barbarous,
   beastly, bestial, bloodthirsty, bloody, bloody-minded, brutal,
   brutalized, brute, brutish, cannibalistic, cruel, cruel-hearted,
   demoniac, demoniacal, devilish, diabolic, fell, feral, ferocious,
   fiendish, fiendlike, fierce, hellish, infernal, inhuman, inhumane,
   murderous, ruthless, sadistic, sanguinary, sanguineous, satanic,
   savage, sharkish, slavering, subhuman, truculent, unchristian,
   uncivilized, unhuman, vicious, wolfish