Definition of morosity in US English:

morosity

noun

  • The state or quality of being morose; morose character or disposition. Formerly also (chiefly in the 17th cent.): †an instance of moroseness (obsolete).

Origin

Mid 16th century. From Middle French, French morosité moroseness, an instance of this and its etymon classical Latin mōrōsitās moroseness from mōrōsus + -tās.

Pronunciation

morosity

/məˈrɒsɪti/