The Collaborative International Dictionary of English v.0.48:

Obloquy \Ob"lo*quy\ ([o^]b"l[-o]*kw[y^]), n. [L. obloquium, fr.
   obloqui. See Oblocutor.]
   1. Censorious speech; defamatory language; language that
      casts contempt on men or their actions; blame;
      reprehension.
      [1913 Webster]

            Shall names that made your city the glory of the
            earth be mentioned with obloquy and detraction?
                                                  --Addison.
      [1913 Webster]

   2. Cause of reproach; disgrace. [Obs.] --Shak.
      [1913 Webster]

   Syn: Reproach; odium; censure; contumely; gainsaying;
        reviling; calumny; slander; detraction.
        [1913 Webster]

WordNet (r) 3.0 (2006):

obloquy
    n 1: state of disgrace resulting from public abuse [syn:
         obloquy, opprobrium]
    2: a false accusation of an offense or a malicious
       misrepresentation of someone's words or actions [syn:
       defamation, calumny, calumniation, obloquy,
       traducement, hatchet job]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "obloquy":
   abuse, adverse criticism, animadversion, aspersion, bad notices,
   bad press, billingsgate, calumny, captiousness, carping, cavil,
   caviling, censoriousness, contumely, criticism, degradation,
   demotion, depluming, discredit, disesteem, dishonor, displuming,
   disrepute, exception, faultfinding, flak, hairsplitting, hit,
   home thrust, hostile criticism, hypercriticalness, hypercriticism,
   ignobility, ignominiousness, ignominy, imputation, infamousness,
   infamy, ingloriousness, invective, knock, loss of honor, nagging,
   niggle, niggling, nit, nit-picking, odium, opprobrium,
   overcriticalness, pestering, pettifogging, priggishness, quibble,
   quibbling, rap, reflection, reproachfulness, revilement,
   scurrility, shame, slam, slur, stricture, swipe, taking exception,
   trichoschistism, vilification, vituperation