Thesaurus

sleepless

adjective

Synonyms & Antonyms of sleepless

not sleeping or able to sleep
  • lay sleepless with worry

Synonyms for sleepless

Words Related to sleepless

Near Antonyms for sleepless

Antonyms for sleepless

See the Dictionary Definition 

Keep scrolling for more

Learn More about sleepless

Time Traveler for sleepless

Time Traveler

The first known use of sleepless was in the 15th century

See more words from the same century

Cite this Entry

“Sleepless.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/sleepless. Accessed 17 Jan. 2021.

Keep scrolling for more

More from Merriam-Webster on sleepless

Dictionary: Definition of sleepless

Medical Dictionary: Definition of sleepless

Nglish: Translation of sleepless for Spanish Speakers

Britannica English: Translation of sleepless for Arabic Speakers

Comments on sleepless

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

WORD OF THE DAY

Test Your Vocabulary

Words of Snow and Ice Quiz

  • image1037863653
  • Which of the following refers to thin, bending ice, or to the act of running over such ice?
True or False

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

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

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!