Webster’s Revised Unabridged Dictionary · 1913
Sulkiness
Sulk′i·ness, n. [For sulkenness, fr. AS. solcen slothful, remiss, in āsolcen, besolcen, properly p. p. of sealcan in āsealcan to be weak or slothful; of uncertain origin.] The quality or state of being sulky; sullenness; moroseness; as, sulkiness of disposition.