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cataclysmaladjectiveor cataclysmic bringing about ruin or misfortunea cataclysmal decision to plunge the nation into war calamitous, catastrophic, damning, destructive, disastrous, fatal, fateful, ruinous, unfortunate apocalyptic(also apocalyptical)hapless, ill-fated, ill-starred, lucklessadverse, baleful, baneful, damaging, deleterious, detrimental, evil, harmful, hurtful, ill, injurious, noxious, pernicious, prejudicial fluky(also flukey), fortuitous, fortunate, happy, lucky, providentialauspicious, bright, encouraging, fair, golden, heartening, hopeful, optimistic, promising, propitious, rose-colored, rosy, upbeat causing or tending to cause destructiona cataclysmal landslide that virtually wiped out the village annihilatory, calamitous, destructive, devastating, devastative, disastrous, ruinous antibiotic, biocidalbaleful, deadly, deathly, fatal, fell, killer, lethal, mortal, murderous, pestilent, poisonous, virulent, vitaldeleterious, detrimental, harmful, pernicious nondestructive preservative, protectiveconstructive, creative, formative, productiveharmless, innocent, innocuous, inoffensiveameliorative, helpful, usefulhealthful, healthy, nonfatal, nonlethal, salubrious, wholesome marked by sudden or violent disturbancethe French Revolution was one of the great cataclysmal events in modern history convulsive, stormy, tempestuous, tumultuous, turbulent fitful, spasmodic, sporadicboisterous, clamorous, furious, noisy, riotous calm, peaceful, placid, serene, tranquil, undisturbed, unperturbed, unshaken, untroubled |