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]

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "blurred":
   aleatoric, aleatory, amorphic, amorphous, anarchic, baggy, blear,
   bleared, bleary, blobby, blurry, breathy, broad, chance, chancy,
   chaotic, characterless, choked, choking, confused, croaking, dark,
   dim, disordered, disorderly, drawling, drawly, dysphonic, faint,
   featureless, feeble, filmy, foggy, formless, fuzzy, general,
   guttural, half-seen, half-visible, harsh, hawking, hazy,
   hit-or-miss, hoarse, ill-defined, imprecise, inaccurate,
   inarticulate, inchoate, incoherent, inconspicuous, indecisive,
   indefinable, indefinite, indeterminable, indeterminate, indistinct,
   indistinguishable, inexact, inform, kaleidoscopic, lax, lisping,
   loose, low-profile, lumpen, merely glimpsed, mispronounced, misty,
   muzzy, nasal, nondescript, nonspecific, obscure, orderless,
   out of focus, pale, quavering, random, semivisible, shadowed forth,
   shadowy, shaking, shaky, shapeless, snuffling, stifled, stochastic,
   strangled, sweeping, thick, throaty, tremulous, twangy, uncertain,
   unclear, undefined, undestined, undetermined, unordered,
   unorganized, unplain, unrecognizable, unspecified, vague, veiled,
   velar, weak