The Collaborative International Dictionary of English v.0.48:

Ugly \Ug"ly\, n.
   A shade for the face, projecting from the bonnet. [Colloq.
   Eng.] --C. Kingsley.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ugly \Ug"ly\, v. t.
   To make ugly. [R.] --Richardson.
   [1913 Webster]

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]

WordNet (r) 3.0 (2006):

ugly
    adj 1: displeasing to the senses; "an ugly face"; "ugly
           furniture" [ant: beautiful]
    2: inclined to anger or bad feelings with overtones of menace;
       "a surly waiter"; "an ugly frame of mind" [syn: surly,
       ugly]
    3: morally reprehensible; "would do something as despicable as
       murder"; "ugly crimes"; "the vile development of slavery
       appalled them"; "a slimy little liar" [syn: despicable,
       ugly, vile, slimy, unworthy, worthless, wretched]
    4: provoking horror; "an atrocious automobile accident"; "a
       frightful crime of decapitation"; "an alarming, even
       horrifying, picture"; "war is beyond all words horrible"-
       Winston Churchill; "an ugly wound" [syn: atrocious,
       frightful, horrifying, horrible, ugly]

Moby Thesaurus II by Grady Ward, 1.0:

145 Moby Thesaurus words for "ugly":
   abominable, alarming, awkward, bad, bad-tempered, base, bearish,
   beautiless, bitchy, bitter, blemished, blotted, cacophonic,
   cacophonous, cankered, cantankerous, churlish, corrupt, crabbed,
   crabby, cranky, critical, cross, cross-grained, crotchety, crusty,
   cussed, dangerous, dangersome, debased, defaced, degenerate,
   depraved, despicable, detestable, disadvantageous, disagreeable,
   discomforting, disfigured, disgusting, dislikable, displeasing,
   disquieting, distasteful, dysphemistic, dysphemized, evil,
   excitable, execrable, explosive, feisty, filthy, foul, fractious,
   fraught with danger, ghastly, grotesque, gruesome, hateful,
   hazardous, heinous, hideous, homely, hostile, huffish, huffy,
   ill-favored, ill-tempered, immoral, inelegant, irascible,
   irritable, jeopardous, loathsome, marred, mean, menacing, mephitic,
   nasty, nauseating, nauseous, noisome, objectionable, obnoxious,
   odious, offensive, ominous, ornery, parlous, periculous, perilous,
   perverse, perverted, plain, repellent, repugnant, repulsive,
   revolting, rotten, serious, short on looks, sickening, snappish,
   sordid, sour, spiteful, spleeny, splenetic, spoiled, surly, testy,
   thankless, threatening, troublesome, uglified, ugly as hell,
   ugly as sin, unaesthetic, unalluring, unappealing, unappetizing,
   unattractive, unbeautiful, uncomely, uncomfortable, undelectable,
   undelicious, undesirable, unengaging, unenjoyable, unhandsome,
   uninviting, unlikable, unlovely, unpalatable, unpleasant,
   unpleasing, unprepossessing, unpretty, unsavory, unsightly,
   untasteful, unwelcome, vile, waspish