Synonyms of fatal

2 Syllables

deadliest, deadlier, wreckful, septic, parlous, ruinous, noxious, goner, lethal, final, damning, deadly, tragic, deathly, killing, mortal

3 Syllables

pernicious, death-dealing, jeopardous, terminals, baleful, malefic, necrotic, tumbledown, toxicant, fateful, poisonous, dangerous, pestilent, hellfire, baneful, terminal, ill-fated, ill-starred, suicidal, miasmatic, virulent, disastrous, hopeless, malignant

4 Syllables

lethiferous, dangersome, cataclysmic, pestilential, cataclysmal, incurable, remediless, destructive, calamitous, catastrophal, damnatory, mephitical, mortiferous, catastrophic

5 Syllables

extirpative, inoperable, inevitable, immedicable, irremediable, fire-and-brimstone

6 Syllables

annihilative, eradicative, irrecoverable, unrecoverable