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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

The EPA requires facilities under its purview to plan for worst-case scenarios.

From The Wall Street Journal Jun. 19, 2026

“I wouldn’t miss it. Now stop imagining that worst-case scenario in your head over and over. It’s going to be fine.”

From "Sparrow" by Sarah Moon

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

"It turns out it's not the worst case scenario."

From Science Daily May 2, 2026

Earlier this month, government officials drew up a worst case scenario of food shortages, including chicken and pork, by the summer if the war continues.

From BBC Apr. 25, 2026

The worst case of conjunctivitis I’ve ever seen in my life and something else in there I can’t make out.

From "Angela's Ashes: A Memoir" by Frank McCourt

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