The Collaborative International Dictionary of English v.0.48:

Indistinctness \In`dis*tinct"ness\, n.
   The quality or condition of being indistinct; lack of
   definiteness; dimness; confusion; as, the indistinctness of a
   picture, or of comprehension; indistinctness of vision.
   [1913 Webster]

WordNet (r) 3.0 (2006):

indistinctness
    n 1: the quality of being indistinct and without sharp outlines
         [syn: indistinctness, softness, blurriness,
         fogginess, fuzziness] [ant: distinctness,
         sharpness]