严酷的
可怕的
不愉快的（grim的比较级）

Grim \Grim\ (gr[i^]m), a. [Compar. {Grimmer} (-m[~e]r); superl.
{Grimmest} (-m[e^]st).] [AS. grim; akin to G. grimm, equiv.
to G. & D. grimmig, Dan. grim, grum, Sw. grym, Icel. grimmr,
G. gram grief, as adj., hostile; cf. Gr. ?, a crushing sound,
? to neigh.]
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: Syn.-- Fierce; ferocious; furious; horrid; horrible;
frightful; ghastly; grisly; hideous; stern; sullen;
sour.