Synonyms For "Grim" :
1 syllable:
black, blue, dark, down, drab, drear, low, sick, stern
2 syllables:
depressed, dingy, dismal, dour, downcast, dreary, ghastly, gloomy, grisly, gruesome, mordant, sorry
3 syllables:
alarming, downhearted, forbidding, macabre, relentless, sarcastic, unpleasant
4 syllables:
disconsolate, dispirited, implacable, unforgiving, unrelenting