Dour describes something sullen, gloomy, or persistent. You might look dour on your way to picking up your last check from the job you just got fired from, and people should get out of your way.

Dour and endure most likely come from the Latin word durus which means "hard." If something is hard to endure for a long enough time, it can make even the most happy-go-lucky person dour. Dour sounds like sour (or closer to "do-er"). It's a tomato/tamahto word, but either way — if you're in a sour mood, you have no sense of humor, and you're dour.

Definitions of dour

adj showing a brooding ill humor

“the proverbially dour New England Puritan”
dark, glowering, glum, moody, morose, saturnine, sour, sullen
having an irritable and unpleasant disposition

adj stubbornly unyielding

dour determination”
dogged, persistent, pertinacious, tenacious, unyielding
obstinate, stubborn, unregenerate
tenaciously unwilling or marked by tenacious unwillingness to yield

adj harshly uninviting or formidable in manner or appearance

“a dour, self-sacrificing life”
forbidding, grim
disagreeable to the senses, to the mind, or feelings

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