glum; gloomy; looking sad and serious; not cheerful
He is always wearing such a dour expression that I feel sure he must be a deeply unhappy man.
despondent, dour, lugubrious, maudlin, morose, saturnine
blithe, buoyant, ebullient, jocular
He is so 'rude' he shows me the door (rhymes with dour) everytime I come to talk. "Dour" looks like "sour. " A person with a sour expression is clearly feeling very dour, that is, sullen and gloomy