Adjective

• S: (adj) dogged, dour, persistent, pertinacious, tenacious, unyielding (stubbornly unyielding) "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"
• S: (adj) dour, forbidding, grim (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
• S: (adj) dark, dour, glowering, glum, moody, morose, saturnine, sour, sullen (showing a brooding ill humor) "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"