The Collaborative International Dictionary of English v.0.48:

Obfuscate \Ob*fus"cate\, a. [L. obfuscatus, p. p. of obfuscare
   to darken; ob (see Ob-) + fuscare, fuscatum, to darken,
   from fuscus dark.]
   Obfuscated; darkened; obscured. [Obs.] [Written also
   offuscate.] --Sir. T. Elyot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Obfuscate \Ob*fus"cate\, v. t. [imp. & p. p. Obfuscated; p.
   pr. & vb. n. Obfuscating.]
   1. To darken; to obscure; to becloud.
      [1913 Webster]

   2. Hence: To confuse; to bewilder; to make unclear.
      [1913 Webster]

            His head, like a smokejack, the funnel unswept, and
            the ideas whirling round and round about in it, all
            obfuscated and darkened over with fuliginous matter.
                                                  --Sterne.
      [1913 Webster]

            Clouds of passion which might obfuscate the
            intellects of meaner females.         --Sir. W.
                                                  Scott.
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WordNet (r) 3.0 (2006):

obfuscate
    v 1: make obscure or unclear [ant: clarify, clear up,
         elucidate]