grimmest

1. not to be placated or appeased or moved by entreatyExamples: "grim determination"; "grim necessity"; "Russia's final hour, it seemed, approached with inexorable certainty"Synonyms: grim, inexorable, relentless, stern, unappeasable, unforgiving, unrelenting

2. shockingly repellent; inspiring horrorExamples: "ghastly wounds"; "the grim aftermath of the bombing"; "the grim task of burying the victims"Synonyms: ghastly, grim, grisly, gruesome, macabre, sick

3. harshly ironic or sinisterExamples: "black humor"; "a grim joke"; "grim laughter"Synonyms: black, grim, mordant

4. harshly uninviting or formidable in manner or appearance; ; ; ; - J.M.BarrieExamples: "a dour, self-sacrificing life"; "a forbidding scowl"; "a grim man loving duty more than humanity"Synonyms: dour, forbidding, grim

5. filled with melancholy and despondencyExamples: "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"Synonyms: blue, depressed, dispirited, down, down in the mouth, downcast, downhearted, gloomy

6. causing dejectionExamples: "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"Synonyms: blue, dark, dingy, disconsolate, dismal, drab, drear, dreary