Synonyms of ominous

1 Syllable

weird, dark, dire, grim

2 Syllables

doomed, monstrous, creepier, creepy, dismal, pending, haunting, doomful, clouded, grabber, prescient, warning, delphian, spooky, hurtful, troublous, weirder, weirdest, fearful, grimmer, spookier, grimmest, malign, gloomy

3 Syllables

direful, disturbing, hostile, teratoid, baneful, imposing, perilous, forbidding, blackhearted, nightmarish, hellfire, upsetting, ill-fated, unlucky, threatening, portentous, baleful, malefic, lowering, unfriendly, traumatic, ill-boding, dangerous, unsettling, impending, presaging, sinister, miscreated, augural, indicial, perturbing, fateful, prophetic

4 Syllables

oracular, evidential, unpropitious, malificent, precursive, monitorial, evincive, minatory, inauspicious, unpromising, suggestive

5 Syllables

fire-and-brimstone, unfavorable, exhortatory, premonitory, indicative, inhospitable, apocalyptic, indicatory

6 Syllables

significatory