| sound asleep(expression, adjective, idiom, inactivity, asleep) | |
| stagnant(adjective, motionless, quiescence) | |
| torpid | |
| calm(adjective, motionless, quiescence) | |
| slow(adjective, inactivity) | |
| at rest(expression, adjective, idiom) | |
| becalmed(adjective, motionless, quiescence) | |
| cataleptic | |
| dead(adjective, motionless) | |
| dopey | |
| fast asleep(expression, idiom, inactivity) | |
| fixed(adjective, motionless, quiescence) | |
| flat(noun, place, house, home, location) | |
| foul | |
| hibernating(adjective, inactive, unconscious, asleep, dormant) | |
| idle(adjective, motionless) | |
| languid(adjective, motionless) | |
| motionless(adjective, motionless, quiescence) | |
| nodding(adjective, sleepy) | |
| passive |
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| APA | Smart Define. (2015). sleeping thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sleeping/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sleeping thesaurus" https://smartdefine.org/sleeping/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, sleeping thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sleeping/thesaurus/synonyms>. |
| MLA | Smart Define. "sleeping thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/sleeping/thesaurus/synonyms> |