Main entry: dark, dour, glowering, glum, saturnine, sour, sullen, moody, morose
Definition: 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
Main entry: grim, dour, forbidding
Definition: harshly uninviting or formidable in manner or appearance
Usage: 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
Main entry: unyielding, dogged, dour, tenacious, persistent, pertinacious
Definition: 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