The Collaborative International Dictionary of English v.0.48:

Humiliate \Hu*mil"i*ate\, v. t. [imp. & p. p. Humiliated; p.
   pr. & vb. n. Humiliating.] [L. humiliatus, p. p. of
   humiliare. See Humble.]
   To reduce to a lower position in one's own eyes, or in the
   eyes of others; to cause a loss of pride or dignity; to
   humble; to mortify.
   [1913 Webster]

         We stand humiliated rather than encouraged. --M.
                                                  Arnold.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

humiliating \humiliating\ adj.
   causing humiliation. [Narrower terms: undignified (vs.
   dignified)]

   Syn: demeaning, humbling, mortifying.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

humiliating
    adj 1: causing awareness of your shortcomings; "golf is a
           humbling game" [syn: demeaning, humbling,
           humiliating, mortifying]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "humiliating":
   abusive, atrocious, awkward, backhand, backhanded, beneath one,
   calumnious, chastening, cheap, contumelious, crushing, debasing,
   degrading, demeaning, deplorable, disconcerting, disgraceful,
   disturbing, embarrassing, gutter, humbling, humiliative, infra dig,
   infra indignitatem, insolent, insulting, left-handed, mortifying,
   offensive, opprobrious, outrageous, pitiful, sad, scandalous,
   scurrile, scurrilous, shameful, shocking, sorry, too bad,
   unbecoming, unspeakable, unworthy of one