Source : Webster's Revised Unabridged Dictionary (1913)

Surly \Sur"ly\, a. [Compar. {Surlier}; superl. {Surliest}.]
   [Probably from sir, and originally meaning, sirlike, i.e.,
   proud. See {Sir}, and {Like}, a.]
   1. Arrogant; haughty. [Obs.] --Cotgrave.

   2. Gloomily morose; ill-natured, abrupt, and rude; severe;
      sour; crabbed; rough; sullen; gloomy; as, a surly groom; a
      surly dog; surly language; a surly look. ``That surly
      spirit, melancholy.'' --Shak.

   3. Rough; dark; tempestuous.

            Now softened into joy the surly storm. --Thomson.

Source : WordNet®

surly
     adj : inclined to anger or bad feelings with overtones of menace;
           "a surly waiter"; "an ugly frame of mind" [syn: {ugly}]
     [also: {surliest}, {surlier}]

surliest
     See {surly}