| cataleptic | |
| catlike | |
| chloroformed | |
| clear | |
| cloddish(adjective, dull) | |
| compliant(adjective, quiet, flat, indifferent, apathetic) | |
| cool(adjective, quiet, indifferent, apathetic, lifeless) | |
| dallying(dull, idle, sluggish, inactive, lethargic) | |
| dense(adjective, dull) | |
| dim(adjective, dull) | |
| discontented(adjective, beat, gloomy, sick, depressed) | |
| disengaged(adjective, dull, idle, sluggish, lazy) | |
| disgusted(adjective, beat, gloomy, sick, depressed) | |
| do-nothing(adjective, dull, idle, sluggish, lazy) | |
| docile(adjective, quiet, flat, indifferent, apathetic) | |
| dog-tired(adjective, beat, weary, tired, stale) | |
| doltish(adjective, dull) | |
| done in(expression, adjective, beat, weary, tired) | |
| doped | |
| dopy(adjective, tired, lethargic, dazed, drowsy) |
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| APA | Smart Define. (2016). sleepy thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sleepy/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "sleepy thesaurus" https://smartdefine.org/sleepy/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, sleepy thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sleepy/thesaurus/synonyms>. |
| MLA | Smart Define. "sleepy thesaurus" 18 February 2016. Web. 24 September 2026. <https://smartdefine.org/sleepy/thesaurus/synonyms> |