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Definition of sleepless

sleepless

/ˈsliːp.ləs/
sleep · less
Adverb:sleeplessly
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sleepless Lexical Profile

sleepless Game Scores & Validity

• adjective

1

Characterized by an inability to sleep, or passed without sleeping (especially of a person or a period of time).

Example

"The anxious parents spent a sleepless night waiting for news from the hospital."

2

Continually active, alert, or vigilant without pause or rest.

Example

"The coastal lighthouse maintained a sleepless watch over the rocky harbor."

Synonyms
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Antonyms
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• Nearby Words

sleepily
sleepiness
sleeping bag
sleepless
sleeplessly
sleeplessness
sleeplike

Word Origin & Etymology

From Old English slæpleas, formed from slæp ('sleep') and the privative suffix -leas ('without').

Cite this Entry

Wordmom. (2026). Definition of Sleepless. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/sleepless
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