6
phlegmatic(adjective, quiet, easy, slow, relaxed)
6
yawning(adjective, dull, tired)
5
inanimate(adjective, still, lifeless, lethargic, languid)
5
indolent(adjective, dull, quiet, easy, careless)
5
lackadaisical(adjective, dull, quiet, easy, slow)
4
droopy(adjective, weary)
4
drugged(adjective, cold, dead, tired, senseless)
4
faint(adjective, slow, still, weary, stale)
4
groggy
4
leaden(still, sluggish, lifeless, lazy, listless)
4
limp(adjective, dull, slow, relaxed, still)
4
motionless(adjective, dull, quiet, flat, indifferent)
4
napping
4
narcotic(adjective, awareness)
4
opiate(noun, adjective, awareness)
4
oscitant
4
out of it(expression, adjective, idiom, dull, quiet)
4
ponderous(adjective, dull)
4
pooped(adjective, beat, weary, tired, stale)
4
slothful(adjective, dull, quiet, careless, heavy)
10 years ago|18k views|share |citing 
APASmart Define. (2016). sleepy thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sleepy/thesaurus/synonyms
ChicagoSmart Define. 2016. "sleepy thesaurus" https://smartdefine.org/sleepy/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, sleepy thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sleepy/thesaurus/synonyms>.
MLASmart Define. "sleepy thesaurus" 18 February 2016. Web. 24 September 2026. <https://smartdefine.org/sleepy/thesaurus/synonyms>