The Collaborative International Dictionary of English v.0.48:

Brazen \Bra"zen\, v. t. [imp. & p. p. Brazened; p. pr. & vb.
   n. Brazening.]
   To carry through impudently or shamelessly; as, to brazen the
   matter through.
   [1913 Webster]

         Sabina brazened it out before Mrs. Wygram, but inwardly
         she was resolved to be a good deal more circumspect.
                                                  --W. Black.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Brazen \Bra"zen\, a.[OE. brasen, AS. br[ae]sen. See Brass.]
   1. Pertaining to, made of, or resembling, brass.
      [1913 Webster]

   2. Sounding harsh and loud, like resounding brass.
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   3. Impudent; immodest; shameless; having a front like brass;
      as, a brazen countenance.
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   Brazen age.
      (a) (Myth.) The age of war and lawlessness which succeeded
          the silver age.
      (b) (Arch[ae]ol.) See under Bronze.

   Brazen sea (Jewish Antiq.), a large laver of brass, placed
      in Solomon's temple for the use of the priests.
      [1913 Webster]

WordNet (r) 3.0 (2006):

brazen
    adj 1: unrestrained by convention or propriety; "an audacious
           trick to pull"; "a barefaced hypocrite"; "the most
           bodacious display of tourism this side of Anaheim"- Los
           Angeles Times; "bald-faced lies"; "brazen arrogance";
           "the modern world with its quick material successes and
           insolent belief in the boundless possibilities of
           progress"- Bertrand Russell [syn: audacious,
           barefaced, bodacious, bald-faced, brassy,
           brazen, brazen-faced, insolent]
    2: made of or resembling brass (as in color or hardness)
    v 1: face with defiance or impudence; "brazen it out"