dour (adj.)

mid-14c., "severe" (of grief); late 14c., of men, "bold, stern, fierce," a word from Scottish and northern England dialect, probably directly from Latin durus "hard," from PIE *dru-ro-, suffixed variant form of root *deru- "be firm, solid, steadfast." Sense of "gloomy, sullen" is late 15c. Related: Dourness.