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Definitions

sleepy

[slee-pee] / ˈsli pi /
ADJECTIVE
tired, dull
Synonyms
STRONGEST
drowsy lethargic listless quiet sluggish
WEAK
asleep blah comatose dopey dozy draggy heavy hypnotic inactive out out of it sleeping sleepyhead slow slumberous slumbersome snoozy somnolent soporific torpid yawning
Antonyms
STRONGEST
active alert energetic lively
WEAK
animated awake unsleepy

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Over the next few weeks, Roo became sleepy and lost his appetite.

From BBC • Apr. 16, 2026

Opening with “Catch These Fists,” the set seemed to wake up Coachella’s typically sleepy Sunday with a jolt of rock.

From Los Angeles Times • Apr. 13, 2026

They were less sleepy and could remain awake longer during simulated work hours.

From Science Daily • Apr. 1, 2026

That may still be faster growth than what the sleepy sector is used to.

From The Wall Street Journal • Mar. 30, 2026

A second human sticks the tube over my muzzle, and the air becomes sweet and I am sleepy, oh so sleepy...

From "Wayward Creatures" by Dayna Lorentz