doomsday

American  

[doomz-dey] / ˈdumzˌdeɪ /

noun

1. Theology. the day of the Last Judgment, at the end of the world.

2. any day of judgment or sentence.

3. nuclear destruction of the world.

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adjective

1. given to or marked by forebodings or predictions of impending calamity; especially concerned with or predicting future universal destruction.

   the doomsday issue of all-out nuclear war.

2. capable of causing widespread or total destruction.

   doomsday weapons.

doomsday British  

/ ˈduːmzˌdeɪ /

noun

1. (sometimes capital) the day on which the Last Judgment will occur

2. any day of reckoning

3. (modifier) characterized by predictions of disaster

   doomsday scenario

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Etymology

Origin of doomsday

First recorded before 1000; Middle English domes dai, Old English dōmesdæg “Judgment Day”; equivalent to doom ( def. ) + 's ¹ ( def. ) + day ( def. )

Explanation

In many religions, doomsday is the end of the world and the moment of final judgment. In your everyday life, doomsday might be the date of the final exam in your math class. Doomsday means utter catastrophe, in both religious and secular contexts. Many faiths believe in a literal doomsday, when life as we know it will come to an end. For centuries people have attempted to predict when this will occur, with the most recent guesses including 2011, 2012, and 2021. Generally, a doomsday scenario is any event that could cause human extinction, like catastrophic climate change or an asteroid impact. The Germanic root of doomsday means "judgment day."

Example Sentences

See Examples For:

doomsday

For all the doomsday predictions that AI will make management consultants obsolete, Boston Consulting Group CEO Christoph Schweizer has this retort: Look at the business.

From The Wall Street Journal ● May 28, 2026

Reports of more ships transiting through Hormuz, meanwhile, seemed to “reduce the risk of some of the doomsday predictions” for global oil supplies.

From MarketWatch ● May 20, 2026

Yet that doomsday thinking is misguided, writes Bernstein analyst Aneesha Sherman, who argues that brands will be the big winners from agentic AI shopping.

From Barron's ● May 12, 2026

Derek Muller, an election law expert, suggests that scenario is little more than a fever dream of doomsday devotees and overly nervous Nellies.

From Los Angeles Times ● Apr. 26, 2026

During those chaotic years, as the basic functioning of Kim Jong Il’s government stalled, think tank experts in the West were writing books with doomsday titles such as The End of North Korea.

From "Escape from Camp 14: One Man's Remarkable Odyssey from North Korea to Freedom in the West" by Blaine Harden