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

The pink cloud at the center of the shot is the Homunculus Nebula, a vast glowing structure of interstellar dust and gas 7,500 light-years from Earth, according to NASA, created in the wake of a cataclysmic eruption of the double star system Eta Carinae. —Anthony Wood, Space.com, 8 Apr. 2026

Iran has pledged to retaliate against such facilities in Israel, meaning the entire Middle East may be on the brink of cataclysmic doom — with or without the terrifying prospect of nuclear strikes. —Voice Of The People, New York Daily News, 3 Apr. 2026

Early-season injuries and off-ice drama have clearly played a role in how this turned out, and Foote wouldn’t be the first NHL bench boss to have a cataclysmic first season and then improve significantly thereafter (see Jared Bednar). —Thomas Drance, New York Times, 1 Apr. 2026

In its many guises, idolatry has survived, despite regular and often cataclysmic proof of its dangers, for centuries and many people will consider a much-larger-than-life golden statue of a president to be perfectly splendid. —Culture Critic, Los Angeles Times, 1 Apr. 2026

The lush biodiversity of South America's rainforests is rooted in one of the most cataclysmic events that ever struck Earth. —Big Think, 31 Mar. 2026

From directors Phil Lord and Chris Miller, the sci-fi dramedy follows Ryan Gosling as a brainy school teacher who is sent into space to save the Sun from a cataclysmic blackout. —Jack Dunn, Variety, 28 Mar. 2026

Public resistance flared after the cataclysmic 1986 Chernobyl and 2011 Fukushima nuclear meltdowns. —ABC News, 25 Mar. 2026

The result would be the cataclysmic breakup of a country of 240 million people. —Obi Anyadike, semafor.com, 23 Mar. 2026