- Definitions|2
- Thesaurus|126
- Abbreviations|0
| lethargic | |
| napping | |
| sluggish | |
| slumberous | |
| somnifacient | |
| somnorific(adjective, dulling, confidentiality, somniferous, somnifacient) | |
| soporous | |
| stupefacient(adjective, dulling, confidentiality, somniferous, somnifacient) | |
| stupefactive(adjective, dulling, confidentiality, somniferous, somnifacient) | |
| uninteresting | |
| anodyne | |
| causing sleep(expression, idiom) | |
| dulling | |
| heavy with sleep(expression, idiom, inactivity) | |
| inviting slumber(expression, idiom) | |
| lethargical | |
| muffling | |
| painkilling | |
| sleep-inducing(adjective, sleep) | |
| sleep inducing(expression, idiom) |
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| APA | Smart Define. (2013). soporiferous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/soporiferous/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "soporiferous thesaurus" https://smartdefine.org/soporiferous/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2013, soporiferous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/soporiferous/thesaurus/synonyms>. |
| MLA | Smart Define. "soporiferous thesaurus" 28 June 2013. Web. 28 September 2026. <https://smartdefine.org/soporiferous/thesaurus/synonyms> |