Grim a. [Compar. Grimmer superl. Grimmest ]  Of forbidding or fear-inspiring aspect; fierce; stern; surly; cruel; frightful; horrible.
    Whose grim aspect sets every joint a-shaking.   --Shak.
    The ridges of grim war.   --Milton.
 Syn:-- Fierce; ferocious; furious; horrid; horrible; frightful; ghastly; grisly; hideous; stern; sullen; sour.
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 grimmest
      See grim
 grim
      adj 1: not to be placated or appeased or moved by entreaty; "grim
             determination"; "grim necessity"; "Russia's final
             hour, it seemed, approached with inexorable
             certainty"; "relentless persecution"; "the stern
             demands of parenthood" [syn: inexorable, relentless,
              stern, unappeasable, unforgiving, unrelenting]
      2: shockingly repellent; inspiring horror; "ghastly wounds";
         "the grim aftermath of the bombing"; "the grim task of
         burying the victims"; "a grisly murder"; "gruesome
         evidence of human sacrifice"; "macabre tales of war and
         plague in the Middle ages"; "macabre tortures conceived by
         madmen" [syn: ghastly, grisly, gruesome, macabre]
      3: harshly ironic or sinister; "black humor"; "a grim joke";
         "grim laughter"; "fun ranging from slapstick clowning ...
         to savage mordant wit" [syn: black, mordant]
      4: causing dejection; "a blue day"; "the dark days of the war";
         "a week of rainy depressing weather"; "a disconsolate
         winter landscape"; "the first dismal dispiriting days of
         November"; "a dark gloomy day"; "grim rainy weather" [syn:
          blue, dark, depressing, disconsolate, dismal, dispiriting,
          gloomy]
      5: 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 [syn:
         dour, forbidding]
      6: characterized by hopelessness; filled with gloom; "gloomy at
         the thought of what he had to face"; "gloomy predictions";
         "a gloomy silence"; "took a grim view of the economy";
         "the darkening mood" [syn: gloomy, darkening]
      [also: grimmest, grimmer]