noun
unsightliness, homeliness, hideousness, repulsiveness, loathsomeness, unseemliness, uncomeliness, offensiveness, deformity, bad looks, ill looks, ill-favored countenance, plainness, disfigurement, monstrousness, grim aspect, foulness, horridness, inelegance, frightfulness, fearfulness, odiousness, unloveliness.
Antonyms beauty*, fairness, attractiveness.