ˌan-tī- How to pronounce anti-sleep (audio)
variants or less commonly antisleep
: opposed to sleep or designed to prevent sleep
cars equipped with anti-sleep alarms
I try to distract myself by thinking about something peaceful, but my brain won't play along. My brain is firmly anti-sleep. It believes sleep is to be avoided.Richard Glover

Word History

First Known Use

1912, in the meaning defined above

Time Traveler
The first known use of anti-sleep was in 1912

Dictionary Entries Near anti-sleep

Cite this Entry

“Anti-sleep.” Dictionary, Merriam-Webster, Accessed 8 Feb. 2023.

Love words? Need even more definitions?

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

Fashionable Words

  • dog-sunglasses-scarf
  • Which of these items is named for a deadly weapon?
True or False

Test your knowledge - and maybe learn something along the way.

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?