cataclysmal

adjective

variants or cataclysmic
1
as in disastrous
bringing about ruin or misfortune a cataclysmal decision to plunge the nation into war

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2
as in devastating
causing or tending to cause destruction a cataclysmal landslide that virtually wiped out the village

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Antonyms & Near Antonyms
3
as in turbulent
marked by sudden or violent disturbance the French Revolution was one of the great cataclysmal events in modern history

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of cataclysmal These cataclysmic explosions spray intense radiation and beams of energy through the universe at close to the speed of light. — Robin George Andrews, Scientific American, 20 Oct. 2026 Washburn even puts some of the exact words into Jeanie’s mouth that George used, to more harrowing effect, in her own cataclysmic climax. — Sara Holdren, Vulture, 15 Oct. 2026 The impact created the 120-mile-wide (190 km) Chicxulub crater in a cataclysmic event that drove mass extinctions across the planet, eliminating nearly three-quarters of the species that thrived on Earth until that time. — Micah Hanks, Space.com, 12 Oct. 2026 Some of the most cataclysmic events in the cosmos, such as mergers of supermassive black holes, should produce a very specific gravitational wave signature, according to general relativity. — Stephen Clark, ArsTechnica, 7 Oct. 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 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
Recent Examples of Synonyms for cataclysmal
  1. disastrous
  2. devastating
  3. turbulent
  4. fatal
  5. destructive
  6. unfortunate
  7. catastrophic
Adjective
  • But real power, particularly in numbers, can make things happen or stop really disastrous things from happening.
    — Yvonne Villarreal, Los Angeles Times, 16 Oct. 2026
  • The 46-year-old was dismissed from the Mets halfway through the 2026 season after a disastrous start, which included a 12-game losing streak in April.
    — Frederick Sutton Sinclair, CBS News, 15 Oct. 2026
Definition of disastrous
Adjective
  • That changed after the devastating Glass Fire swept through Napa County in 2020, destroying parts of nearby Deer Park and threatening his community.
    — Kenny Choi, CBS News, 16 Oct. 2026
  • Boasting a devastating, quick attacking unit in Cole Palmer, Rogers and Joao Pedro, Chelsea’s instinct has been to sit back and invite opponents forward, creating gaps to exploit on the counter.
    — Conor O'Neill, New York Times, 15 Oct. 2026
Definition of devastating
Adjective
  • The escalation comes at an increasingly turbulent time for the Middle East’s aviation sector.
    — Carolyn Hax, Washington Post, 11 Oct. 2026
  • Since Pollock was a turbulent man, living with him was never very calm.
    — Barbara Rose, Vogue, 11 Oct. 2026
Definition of turbulent
Adjective
  • In 2006, a 45-year-old with a heart condition suffered a fatal heart attack while aboard the park's Goliath ride.
    — DEMOCRAT-GAZETTE STAFF FROM WIRE REPORTS, Arkansas Online, 13 Oct. 2026
  • Mystery still surrounds the fatal shooting on the set of Alec Baldwin’s Western Rust, an incident that claimed the life of cinematographer Halyna Hutchins.
    — Matthew Carey, Deadline, 12 Oct. 2026
Definition of fatal
Adjective
  • Amid unusual heat and unrelenting winds, hundreds of firefighters worked to contain several small, but destructive fires that ignited across Southern California.
    — Tony Briscoe, Los Angeles Times, 17 Oct. 2026
  • Kent said embers from burning homes can ignite nearby properties, allowing fires to spread from one structure to another and potentially contribute to larger, more destructive blazes.
    — Steve Large, CBS News, 16 Oct. 2026
Definition of destructive
Adjective
  • Neighbors shocked about stabbing Neighbors say Thomas was known to have mental health issues and called the stabbing unfortunate.
    — Bryan Lynn, CBS News, 16 Oct. 2026
  • To make matters worse, India’s Supreme Court, another vital democratic institution, has also played an unfortunate role in this train of events.
    — Pratap Bhanu Mehta, Foreign Affairs, 15 Oct. 2026
Definition of unfortunate
Adjective
  • Six Flags Magic Mountain permanently closed its X2 roller coaster after multiple lawsuits accused the attraction of causing catastrophic brain injuries.
    — Andrea Margolis, FOXNews.com, 13 Oct. 2026
  • So, Correa repeatedly assured voters that abandoning the dollar would be catastrophic and was not on his agenda.
    — Steve H. Hanke, Fortune, 13 Oct. 2026
Definition of catastrophic

Browse Nearby Words

cataclysm
cataclysmal
cataclysms
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Cite this Entry

“Cataclysmal.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/cataclysmal. Accessed 20 Oct. 2026.

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