Synonyms of baneful

2 Syllables
deadliest, fatal, deadlier, septic, wreckful, toxic, ruinous, harmful, evil, noxious, nocent, doomful, maligns, wicked, deadly, loury, malign, hurtful
3 Syllables
direful, pernicious, baleful, malefic, ominous, lowery, injurious, viperish, tumbledown, toxicant, blackhearted, venomous, impendent, poisonous, pestilent, hellfire, noisome, sinister, praetorian, virulent, threatening, disastrous, maligning
4 Syllables
lethiferous, malificent, inauspicious, unpromising, pestilential, deleterious, minatory, maleficent, destructive, calamitous, precursive, mephitical, ill-omened
5 Syllables
extirpative, unconducive, insalutary, comminatory, fire-and-brimstone, premonitory
6 Syllables
annihilative, eradicative