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]