Sleepiness

noun

noun ·3 syllables ·Uncommon ·Advanced level

Definitions

Noun

1
The property of being sleepy. uncountable, usually
2
a very sleepy state wordnet

Synonyms

acedia apathy boredom brain fag debilitation debility

Antonyms

sleeplessness wakefulness

Example

"This medication causes sleepiness."

Etymology

From sleepy + -ness.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.