'Sulkiness' definitions:

Definition of 'sulkiness'

noun

A mood or display of sullen aloofness or withdrawal; "stayed home in a sulk" [syn: sulk, sulkiness]

noun

A feeling of sulky resentment [syn: sulkiness, huffishness]

noun

A sullen moody resentful disposition [syn: sulkiness, sullenness, moroseness, sourness]

From: GCIDE

Sulkiness \Sulk"i*ness\, n. [For sulkenness, fr. AS. solcen slothful, remiss, in [=a]solcen, besolcen, properly p. p. of sealcan in [=a]sealcan to be weak or slothful; of uncertain origin.] The quality or state of being sulky; sullenness; moroseness; as, sulkiness of disposition. [1913 Webster]