1
besotted(adjective, dull)
1
big yawn(expression, adjective, dull, flat, stupid)
1
black stuff
1
blase
1
blue angel
1
blue devil
1
blue heaven
1
blue velvet
1
blunt(adjective, dull)
1
boorish(adjective, dull)
1
bromide(noun, bother, drag, nuisance, yawn)
1
bummer(noun, bother, drag, nuisance, yawn)
1
calmant
1
cataleptic
1
chloral hydrate
1
cloddish(adjective, dull)
1
codeine
1
codeine cough syrup(expression, idiom)
1
colorless(adjective, dull, flat, ordinary, dry)
1
colourless
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APASmart Define. (2015). soporific thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/soporific/thesaurus/synonyms
ChicagoSmart Define. 2015. "soporific thesaurus" https://smartdefine.org/soporific/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, soporific thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/soporific/thesaurus/synonyms>.
MLASmart Define. "soporific thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/soporific/thesaurus/synonyms>