The Collaborative International Dictionary of English v.0.48:

Ugly \Ug"ly\, a. [Compar. Uglier; superl. Ugliest.] [Icel.
   uggligr fearful, dreadful; uggr fear (akin to ugga to fear) +
   -ligr (akin to E. -ly, like). ??. Cf. Awe.]
   1. Offensive to the sight; contrary to beauty; being of
      disagreeable or loathsome aspect; unsightly; repulsive;
      deformed.
      [1913 Webster]

            The ugly view of his deformed crimes. --Spenser.
      [1913 Webster]

            Like the toad, ugly and venomous.     --Shak.
      [1913 Webster]

            O, I have passed a miserable night,
            So full of ugly sights, of ghastly dreams. --Shak.
      [1913 Webster]

   2. Ill-natured; crossgrained; quarrelsome; as, an ugly
      temper; to feel ugly. [Colloq. U. S.]
      [1913 Webster]

   3. Unpleasant; disagreeable; likely to cause trouble or loss;
      as, an ugly rumor; an ugly customer. [Colloq.]
      [1913 Webster]