Synonyms for Sulkiness (same or very similar meaning)
WordNet sense 1 (a mood or display of sullen aloofness or withdrawal):
sulkWordNet sense 2 (a feeling of sulky resentment):
huffishnessWordNet sense 3 (a sullen moody resentful disposition):
moroseness, sourness, sullennessFrom the ODE community, based on WordNetadd/edit