cataclysmal

1 bringing about ruin or misfortune a cataclysmal decision to plunge the nation into war Synonyms of cataclysmal calamitous, fatal (or cataclysmic), catastrophic, damning, destructive, disastrous, fateful, ruinous, unfortunateWords Related to cataclysmal apocalyptic (also apocalyptical); hapless, ill-fated, ill-starred, luckless; adverse, baleful, baneful, damaging, deleterious, detrimental, evil, harmful, hurtful, ill, injurious, noxious, pernicious, prejudicialNear Antonyms of cataclysmal fluky (also flukey), fortuitous, fortunate, happy, lucky, providential; auspicious, bright, encouraging, fair, golden, heartening, hopeful, optimistic, promising, propitious, rose-colored, rosy, upbeat

2 causing or tending to cause destruction a cataclysmal landslide that virtually wiped out the village Synonyms of cataclysmal annihilatory, calamitous, destructive (or cataclysmic), devastating, devastative, disastrous, ruinousWords Related to cataclysmal antibiotic, biocidal; baleful, deadly, deathly, fatal, fell, killer, lethal, mortal, murderous, pestilent, poisonous, virulent, vital; deleterious, detrimental, harmful, perniciousNear Antonyms of cataclysmal preservative, protective; constructive, creative, formative, productive; harmless, innocent, innocuous, inoffensive; ameliorative, helpful, useful; healthful, healthy, nonfatal, nonlethal, salubrious, wholesomeAntonyms of cataclysmal nondestructive

3 marked by sudden or violent disturbance the French Revolution was one of the great cataclysmal events in modern history Synonyms of cataclysmal convulsive (or cataclysmic), stormy, tempestuous, tumultuous, turbulentWords Related to cataclysmal fitful, spasmodic, sporadic; boisterous, clamorous, furious, noisy, riotousNear Antonyms of cataclysmal calm, peaceful, placid, serene, tranquil, undisturbed, unperturbed, unshaken, untroubled