Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “sleepless”

See all translations

sleepless

adjective
 
 
/ˈsliːpləs/
sleepless night a night when you are not able to sleep: He'd spent a sleepless night worrying about his exam.Not sleeping and not unconscious
sleeplessness noun [U]
Translations of “sleepless”
in Chinese (Traditional) 失眠的,不能成眠的, 失眠的,無法入睡的…
in Chinese (Simplified) 失眠的,不能成寐的, 失眠的,无法入睡的…
(Definition of sleepless from the Cambridge Learners Dictionary © Cambridge University Press)
Add Cambridge dictionaries to your browser to your website

Definitions of “sleepless” in other dictionaries

Word of the Day

sail

When a boat or a ship sails, it travels on the water.

Word of the Day

Byronic, Orwellian and Darwinian: adjectives from names.

by Liz Walter,
April 15, 2015
Becoming an adjective is a strange kind of memorial, but it is often a sign of a person having had real influence on the world. Science is full of examples, from Hippocrates, the Greek medic born around 460 BC, who gave his name to the Hippocratic Oath still used by doctors today,

Read More 

dumbwalking noun

April 20, 2015
walking slowly, without paying attention to the world around you because you are consulting a smartphone He told me dumbwalking probably wouldn’t be a long-term problem.

Read More