50 entries under lackluster topic. ×

2
stretchy(adjective, dull, stupid, idle, weary)
1
dilatory(adjective, dull, quiet, moderate, easy)
1
having spring fever(expression, adjective, idiom, dull, stupid)
1
impassive(adjective, dull, slow, relaxed, still)
1
laid-back(adjective, quiet, slow, relaxed, indifferent)
1
moony(adjective, quiet, flat, slow, relaxed)
1
nebbish(adjective, dull, slow, relaxed, stupid)
1
sleepyhead(adjective, dull, quiet, slow, relaxed)
1
stolid(adjective, dull, quiet, indifferent, still)
1
wimpy(adjective, dull, slow, relaxed, stupid)
<123>
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APASmart Define. (2016). sleepy thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/sleepy/thesaurus/synonyms
ChicagoSmart Define. 2016. "sleepy thesaurus" https://smartdefine.org/sleepy/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, sleepy thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/sleepy/thesaurus/synonyms>.
MLASmart Define. "sleepy thesaurus" 18 February 2016. Web. 30 September 2026. <https://smartdefine.org/sleepy/thesaurus/synonyms>