eyesore

from WordNet (r) 3.0 (2006)

eyesore
    n 1: something very ugly and offensive

from The Collaborative International Dictionary of English v.0.48

Eyesore \Eye"sore`\, n.
   Something offensive to the eye or sight; a blemish.
   [1913 Webster]

         Mordecai was an eyesore to Haman.        --L'Estrange.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

49 Moby Thesaurus words for "eyesore":
      baboon, bag, blemish, bloodstain, blot, blotch, blur, brand, dab,
      daub, dog, fleck, flick, flyspeck, fright, gargoyle, hag, harridan,
      macula, maculation, macule, mark, mess, monster, monstrosity,
      no beauty, patch, scarecrow, sight, smear, smirch, smouch, smudge,
      smut, smutch, spatter, speck, speckle, splash, splatter, splotch,
      spot, stain, stigma, taint, tarnish, teratism, ugly duckling,
      witch