What is the meaning of dour?

adjective

• Stubbornly unyielding.
  • usage: "dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it- T. S. Eliot; "men tenacious of opinion"
  • synonyms: dogged, persistent, pertinacious, tenacious, unyielding
• Harshly uninviting or formidable in manner or appearance."a dour, self-sacrificing life"; "a forbidding scowl"; "a grim man loving duty more than humanity"; "undoubtedly the grimmest part of him was his iron claw- J. M. Barrie
  • synonyms: forbidding, grim
• Showing a brooding ill humor.
  • usage: "a dark scowl"; "the proverbially dour New England Puritan"; "a glum, hopeless shrug"; "he sat in moody silence"; "a morose and unsociable manner"; "a saturnine, almost misanthropic young genius- Bruce Bliven; "a sour temper"; "a sullen crowd"
  • synonyms: dark, glowering, glum, moody, morose, saturnine, sour, sullen