4
achromatic(adjective, distressed, worn, colorless, stonewashed)
4
ashy(adjective, pale, white, colorless)
4
dingy(adjective, dull, dark, gloomy, faint)
4
dry(adjective, dull, simple, flat, excite)
4
faint(adjective, dull, mean, weak, thin)
4
leaden(adjective, dull, lifeless)
4
muddy
4
muted(adjective, dull, dark, gloomy, faint)
4
obscure(adjective, dull, dim, lifeless)
4
pallid(adjective, mean, weak, thin, ill)
4
somber(adjective, blue, sad, depression, woe)
4
spiritless(adjective, dull, excite, sad, boring)
4
tedious(adjective, dull, simple, flat, plain)
4
toneless(adjective, colorless)
4
unimaginative(adjective, dull, simple, excite, plain)
4
wan(mean, weak, thin, ill, feeble)
3
blah(adjective, dull, simple, flat, low)
3
blind(adjective, dull, lifeless)
3
expressionless
3
gloomy(adjective, dull, blue, sad, dark)
11 years ago|11k views|share |citing 
APASmart Define. (2015). lackluster thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/lackluster/thesaurus/synonyms
ChicagoSmart Define. 2015. "lackluster thesaurus" https://smartdefine.org/lackluster/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, lackluster thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/lackluster/thesaurus/synonyms>.
MLASmart Define. "lackluster thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/lackluster/thesaurus/synonyms>