Webster’s Revised Unabridged Dictionary · 1913
Sulky
Sulk′y (sŭlk′y̆), a. [Compar. Sulkier; superl. Sulkiest.] [See Sulkiness, and cf. Sulky, n.] Moodly silent; sullen; sour; obstinate; morose; splenetic.
Syn. — See Sullen.
Sulk′y, n.; pl. Sulkies (#). [From Sulky, a.; — so called from the owner's desire of riding alone.] A light two-wheeled carriage for a single person.
☞ Sulky is used adjectively in the names of several agricultural machines drawn by horses to denote that the machine is provided with wheels and a seat for the driver; as, sulky plow; sulky harrow; sulky rake, etc.