worst nightmare

noun

: the thing someone fears most
Losing a child is every parent's worst nightmare.

Examples of worst nightmare in a Sentence

Recent Examples on the Web
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.
At first, the couple was hopeful their unborn baby would be okay, but then their worst nightmare came true. Gabriela Vidal, CBS News, 30 Apr. 2026 Mike Minogue is Maura Healey’s worst nightmare. Peter Lucas, Boston Herald, 30 Apr. 2026 This is basically every aerophobic flier’s worst nightmare, and Harlin does a solid job of maintaining the fear factor and shock right up to the moment of Rich’s decision to dump fuel and ditch, since the nearest airport, Guam, is out of range. David Rooney, HollywoodReporter, 28 Apr. 2026 Leeds have beaten them once already this season and could be Chelsea’s worst nightmare at Wembley, as Daniel Farke’s side are set up to exploit many of the weaknesses that ultimately cost Rosenior his job. Graham Ruthven, New York Times, 25 Apr. 2026 See All Example Sentences for worst nightmare

Browse Nearby Words

Cite this Entry

“Worst nightmare.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/worst%20nightmare. Accessed 7 May. 2026.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster