Synonyms of apocalyptic

2 Syllables
doomful, mantic, delphian, vatic, loury
3 Syllables
direful, portentous, indicial, ominous, lowery, blackhearted, fateful, ill-boding, impendent, hellfire, revealing, prophetic, sinister, threatening
4 Syllables
malificent, sibylline, evincive, oracular, evidential, minatory, prophetical, predictive, precursive
5 Syllables
indicative, revelational, comminatory, fire-and-brimstone, premonitory
6 Syllables
significatory, apocalyptical