The Collaborative International Dictionary of English v.0.48:

Blur \Blur\ (bl[^u]r), v. t. [imp. & p. p. Blurred (bl[^u]rd);
   p. pr. & vb. n. Blurring.] [Prob. of same origin as blear.
   See Blear.]
   1. To render obscure by making the form or outline of
      confused and uncertain, as by soiling; to smear; to make
      indistinct and confused; as, to blur manuscript by
      handling it while damp; to blur the impression of a
      woodcut by an excess of ink.
      [1913 Webster]

            But time hath nothing blurred those lines of favor
            Which then he wore.                   --Shak.
      [1913 Webster]

   2. To cause imperfection of vision in; to dim; to darken.
      [1913 Webster]

            Her eyes are blurred with the lightning's glare.
                                                  --J. R. Drake.
      [1913 Webster]

   3. To sully; to stain; to blemish, as reputation.
      [1913 Webster]

            Sarcasms may eclipse thine own,
            But can not blur my lost renown.      --Hudibras.
      [1913 Webster]

   Syn: To spot; blot; disfigure; stain; sully.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

blurred \blurred\ (bl[^u]rd), adj.
   out of focus; not sharply defined.

   Syn: bleary, blurry, foggy, fuzzy, muzzy.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

blurred
    adj 1: indistinct or hazy in outline; "a landscape of blurred
           outlines"; "the trees were just blurry shapes" [syn:
           bleary, blurred, blurry, foggy, fuzzy, hazy,
           muzzy]
    2: unclear in form or expression; "the blurred aims of the
       group"; "sometimes one understood clearly and sometimes the
       meaning was clouded"- H.G.Wells [syn: blurred, clouded]