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Synonyms

cataclysmic

American  
[kat-uh-kliz-mik] / ˌkæt əˈklɪz mɪk /
Or cataclysmal

adjective

  1. of, relating to, or resulting from a cataclysm.

  2. of the nature of, or having the effect of, a cataclysm.

    cataclysmic changes.


Other Word Forms

  • cataclysmically adverb
  • noncataclysmal adjective
  • noncataclysmic adjective

Etymology

Origin of cataclysmic

First recorded in 1850–55; cataclysm + -ic

Explanation

Something that’s cataclysmic is violently destructive. The word often refers to natural disasters, like a cataclysmic earthquake, but cataclysmic can describe other events as well as long as they’re bad enough, like the cataclysmic failure you had making meatloaf. Earthquakes, volcanic eruptions, floods, tornados, landslide . . . These natural disasters are often described as cataclysmic when they cause great devastation. Cataclysmic isn't just for describing natural disasters — personal disasters can be called cataclysmic as well if you want to emphasize just how badly something turned out. If your meatloaf is just so-so, it’s not so disastrous. But if it’s so spectacularly bad that no one can eat it? That’s a cataclysmic failure.

Keep Reading on Vocabulary.com

Vocabulary lists containing cataclysmic

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"These extinctions were driven by relatively rapid climate shifts and cataclysmic volcanic eruptions," says Dr. Scofield.

From Science Daily • Mar. 26, 2026

During oral arguments before the Supreme Court in December, Joshua Rosenkranz, an attorney representing Cox, had warned of "cataclysmic" consequences if the court did not limit the company's copyright liability.

From Barron's • Mar. 25, 2026

Perhaps he causes such extensive mayhem because he is the unintended side effect of a cataclysmic experiment.

From Salon • Mar. 20, 2026

In “Burn the Water,” Ray imagines London in 2425, roughly 300 years after the polar ice caps have collapsed, flooding most of the world in a cataclysmic event.

From Los Angeles Times • Mar. 2, 2026

Clearly something big and abrupt, and probably cataclysmic, had produced this arresting spike.

From "A Short History of Nearly Everything" by Bill Bryson