Synonyms of grim

1 Syllable

drear, bleak, cruel, gaunt, glum, sour, lou, harsh, mule, strict, stern

2 Syllables

deadliest, grumpy, harshest, harsher, wreakful, surly, lurid, gravest, scratchy, spookish, dreadful, strictest, tragic, deathly, gaunter, bleakest, crabbed, sulky, stubborn, mirthless, fierce, doomful, hang-tough, woeful, shocking, grabber, cheerless, deadlier, ruthless, sullen, horrid, ghastlier, let-down, crusty, grouchy, sterner, scowling, frightful, graver, frowning, ghastly, bleaker, deadly, somber, hardshell, squawky, mortal, ghoulish, grisly, sickie, tristful, churlish, serious, morbid, feller, stricter, gauntest, hideous, scratchier, sternest, loury, dogged, gloomy

3 Syllables

gruesome, long-faced, funereal, unsmiling, grim-faced, sobering, relentless, horrific, chapfallen, forbidding, death-dealing, unhappiest, ominous, truculent, austere, terrifying, nightmarish, severest, horrible, coldblooded, severer, unhappy, threatening, depressed, terrible, glowering, severe, traumatic, appalling, impendent, merciless, ferine, sinister, out-of-key, out-of-tune, splenetic, tuneless, ferocious, inhuman, uncompliant, unyielding, unhappier, ghostlike, lowery, tigerish, macabre, godawful, morose, barbarous

4 Syllables

implacable, unrelenting, lamentable, deplorable, resolute, cantankerous, melancholy, iron-fisted, unhumorous, unamusing, foreboding, down-in-the-mouth, woebegone, malificent, remorseless, precursive, drearisome, inhumane, dirgelike, melancholic, iron-handed, formidable, minatory, vindictive, deforested, unrepenting, defunctive, ironfisted, intractable, unbendable, unmelodious

5 Syllables

unhospitable, inexorable, premonitory, unpopulated, unamenable, comminatory, abominable