Source : Webster's Revised Unabridged Dictionary (1913)

Sulky \Sulk"y\, a. [Compar. {Sulkier}; superl. {Sulkiest}.] [See
   {Sulkiness}, and cf. {Sulky}, n.]
   Moodly silent; sullen; sour; obstinate; morose; splenetic.

   Syn: See {Sullen}.

Source : WordNet®

sulky
     adj : sullen or moody [syn: {huffish}]
     n : a light two-wheeled vehicle for one person; drawn by one
         horse
     [also: {sulkiest}, {sulkier}]

sulkiest
     See {sulky}