Synonyms of cataclysmal

cataclysmal

adjective

variants or cataclysmic

1

as in disastrous

bringing about ruin or misfortune

a cataclysmal decision to plunge the nation into war

Synonyms & Similar Words

• disastrous
• fatal
• unfortunate
• catastrophic
• destructive
• damning
• ruinous
• fateful
• calamitous
• apocalyptic
• damaging
• harmful
• detrimental
• pernicious
• adverse
• hapless
• deleterious
• evil
• injurious
• luckless
• hurtful
• prejudicial
• ill-fated
• baneful
• ill-starred
• noxious
• baleful
• ill

Antonyms & Near Antonyms

• happy
• lucky
• fortunate
• fortuitous
• providential
• fair
• optimistic
• golden
• promising
• bright
• encouraging
• hopeful
• fluky
• propitious
• rosy
• upbeat
• auspicious
• heartening
• rose-colored

2

as in devastating

causing or tending to cause destruction

a cataclysmal landslide that virtually wiped out the village

Synonyms & Similar Words

• devastating
• devastative
• disastrous
• destructive
• annihilatory
• ruinous
• deadly
• poisonous
• lethal
• fatal
• calamitous
• fell
• murderous
• antibiotic
• killer
• harmful
• virulent
• detrimental
• pernicious
• biocidal
• deleterious
• mortal
• vital
• baleful
• deathly
• pestilent

Antonyms & Near Antonyms

• protective
• nondestructive
• creative
• productive
• constructive
• useful
• helpful
• harmless
• formative
• innocent
• innocuous
• healthy
• preservative
• healthful
• wholesome
• inoffensive
• ameliorative
• nonlethal
• nonfatal
• salubrious

3

as in turbulent

marked by sudden or violent disturbance

the French Revolution was one of the great cataclysmal events in modern history

Synonyms & Similar Words

• turbulent
• tumultuous
• convulsive
• stormy
• sporadic
• spasmodic
• tempestuous
• boisterous
• noisy
• riotous
• furious
• fitful
• clamorous

Antonyms & Near Antonyms

• peaceful
• calm
• undisturbed
• tranquil
• serene
• unperturbed
• placid
• untroubled
• unshaken

Example Sentences

Recent Examples of cataclysmal

This gave more insight into what happened in the immediate and long-term aftermath of this cataclysmic event. — Elizabeth Rayne, ArsTechnica, 30 Sep. 2026

The simulations showed that moons smaller than 620 miles across were unlikely to retain an ocean after a cataclysmic impact. — Keith Cooper, Space.com, 27 Sep. 2026

Several of the researchers who spoke to NBC News said that humans could leverage AI systems to inflict cataclysmic damage well before recursive self-improvement materializes. — Jared Perlo, NBC news, 19 Sep. 2026

The diagnosis is cataclysmic, bringing Sandra’s career to an abrupt close. — Natalia Winkelman, Variety, 16 Sep. 2026

In 2026, how reasonable are fears that AI, either by escaping human control or through misuse by unscrupulous people, could cause a cataclysmic event or the downfall of civilization? — ABC News, 14 Sep. 2026

Rising global temperatures have made high-mountain areas across the globe more unstable—and the risks of cataclysmic events have increased. — Jackie Flynn Mogensen, Scientific American, 2 Sep. 2026

The mountains above had unleashed a cataclysmic, deluge that swept 62 miles (100 km) downstream, killing hundreds and burying entire communities in the worst natural disaster to hit Nepal in years. — Ross Adkin, CNN Money, 30 Aug. 2026

The effect of the wealth consolidation carefully, and secretly, orchestrated by the SEC and Big 10 has been not catastrophic to those not in these respective leagues, but at least cataclysmic. — Fort Worth Star-Telegram, 26 Aug. 2026