worst nightmare

noun

Definition of worst nightmare

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

Learn More about worst nightmare

Statistics for worst nightmare

Cite this Entry

“Worst nightmare.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/worst%20nightmare. Accessed 13 Aug. 2020.

Comments on worst nightmare

What made you want to look up worst nightmare? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

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