75 entries under lackluster topic. ×

7
weak(adjective, dull, quiet, easy, gentle)
6
dreary(adjective, dull, boring, tedious, monotonous)
6
phlegmatic(adjective, dull, cool, weak, easy)
6
prosaic(adjective, dull, weak, excite, stupid)
6
uninspired(adjective, dull, excite, boring, pale)
5
blah(adjective, dull, weak, easy, sad)
5
passive(adjective, dull, quiet, gentle, careless)
5
slothful(adjective, dull, sad, careless, indifferent)
4
characterless(adjective, dull, weak, stupid, feeble)
4
drab(adjective, dull, weak, excite, stupid)
4
heavy(adjective, dull, quiet, weak, easy)
4
indolent(adjective, dull, slow, careless, relaxed)
4
slow(adjective, dull, weak, easy, relaxed)
4
supine(adjective, dull, weak, easy, slow)
3
bland(adjective, calm, dull, weak, kind)
3
debilitated(adjective, dull, weary, apathetic, tired)
3
draggy(adjective, dull, weak, sad, depressed)
3
exhausted(adjective, weary, tired, sluggish, lifeless)
3
idle(adjective, dull, careless, cold, indifferent)
3
lazy(adjective, dull, weak, easy, slow)
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APASmart Define. (2015). spiritless thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/spiritless/thesaurus/synonyms
ChicagoSmart Define. 2015. "spiritless thesaurus" https://smartdefine.org/spiritless/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, spiritless thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/spiritless/thesaurus/synonyms>.
MLASmart Define. "spiritless thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/spiritless/thesaurus/synonyms>