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  • worst-case
    worst-case
    adjective
    of the worst possibility; being the worst result that could be expected under the circumstances.
  • worst case
    worst case
    noun
Synonyms

worst-case

American  
[wurst-keys] / ˈwɜrstˌkeɪs /

adjective

  1. of the worst possibility; being the worst result that could be expected under the circumstances.

    a worst-case scenario.


worst case British  

noun

    1. a situation in which the most unfavourable conditions prevail

    2. ( as modifier )

      a worst-case projection of a massive accident

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of worst-case

First recorded in 1960–65

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.

See Examples For:

He described that as a "worst-case scenario" option in a YouTube interview with journalist Unsal Unlu.

From Barron's Jul. 11, 2026

The study highlights several worst-case scenarios, including spacecraft accidents involving contaminated materials or astronauts who may have been exposed to extraterrestrial environments.

From Science Daily Jul. 6, 2026

“We are thinking worst-case scenario,” Honsal said, “and we are here to book and uncover whatever evidence we could possibly find.”

From Los Angeles Times Jun. 26, 2026

But they indicated they would act "forcefully" if oil prices did not start to fall, with up to six rate hikes in a worst-case scenario.

From BBC Jun. 17, 2026

For people who spent their workdays watching the ups and downs of reactor pressure and heat, and making constant adjustments to keep things running safely, it was a worst-case scenario.

From "Meltdown" by Deirdre Langeland

What is exempt or not depends on your state’s rules, but often includes cash and bank balances exceeding basic needs, valuable collections, investments and, in the worst case, your home.

From MarketWatch Jul. 10, 2026

“He told me I was the worst case he’d ever seen but he’s so positive, he said: ‘You’ve got great potential,’” McCarthy recalled of his first meeting with O’Mara.

From The Wall Street Journal Jun. 18, 2026

At the trial, Natural England described the damage as the "worst case of riverside destruction" seen by the organisation.

From BBC May 26, 2026

"As a result, the channels can grow and, in the worst case, weaken the stability of the entire ice shelf."

From Science Daily May 10, 2026

Then, in the worst case of bad timing imaginable, a Scoreboard alert flashed on my display, just a few seconds after I began to play through the final screen.

From "Ready Player One: A Novel" by Ernest Cline

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