Synonyms|448Antonyms|147|Broader|2Narrower|0Related|914
2
sterile(adjective, dull, excite, boring, uninteresting)
2
tame(adjective, dull, simple, flat, clean)
2
tarnished(adjective, dull, dark, gloomy, faint)
2
uneventful(adjective, dull, simple, clean, plain)
2
unexciting(adjective, dull, dry, boring, tedious)
2
unsightly(adjective, pretty)
2
vanilla(adjective, dull, simple, clean, plain)
2
washed-out(distressed, worn, stonewashed)
2
washed out(expression, shabby, distressed, worn, tacky)
2
weak(adjective, dull, thin, dark, gloomy)
2
wishy-washy(weak, feeble)
1
absence of color(expression, idiom)
1
achromaticity
1
achromatism
1
achromic
1
actual(adjective, simple, flat, clean, plain)
1
ailing(weak, thin, ill, feeble, pale)
1
anaemic
1
apathetic(adjective, dull, flat, low, sad)
1
aseptic(adjective, excite)
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ChicagoSmart Define. 2015. "lackluster thesaurus" https://smartdefine.org/lackluster/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, lackluster thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/lackluster/thesaurus/synonyms>.
MLASmart Define. "lackluster thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/lackluster/thesaurus/synonyms>