The Collaborative International Dictionary of English v.0.48:

Ignominious \Ig`no*min"i*ous\, a. [L. ignominiosus: cf. F.
   ignominieux.]
   1. Marked with ignominy; incurring public disgrace;
      dishonorable; shameful.
      [1913 Webster]

            Then first with fear surprised and sense of pain,
            Fled ignominious.                     --Milton.
      [1913 Webster]

   2. Deserving ignominy; despicable.
      [1913 Webster]

            One single, obscure, ignominious projector. --Swift.
      [1913 Webster]

   3. Humiliating; degrading; as, an ignominious judgment or
      sentence. --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ignominious
    adj 1: (used of conduct or character) deserving or bringing
           disgrace or shame; "Man...has written one of his blackest
           records as a destroyer on the oceanic islands"- Rachel
           Carson; "an ignominious retreat"; "inglorious defeat";
           "an opprobrious monument to human greed"; "a shameful
           display of cowardice" [syn: black, disgraceful,
           ignominious, inglorious, opprobrious, shameful]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "ignominious":
   aberrant, abnormal, abominable, atrocious, criminal, delinquent,
   derogatory, deviant, discreditable, disgraceful, dishonorable,
   disreputable, evil, hardly the thing, ignoble, illegal, improper,
   inappropriate, incorrect, indecorous, infamous, inglorious,
   not done, not the thing, notorious, off-base, off-color,
   out-of-line, sacrilegious, scandalous, seamy, shabby, shady,
   shameful, shameless, shoddy, sinful, sordid, terrible, undue,
   unfit, unfitting, unlawful, unpraiseworthy, unrespectable,
   unrighteous, unsavory, unseemly, unsuitable, wicked, wrong,
   wrongful