Synonyms|448Antonyms|147|Broader|2Narrower|0Related|914

54 entries under plain topic. ×

1
platitudinous(adjective, dull, simple, flat, clean)
1
plebeian(adjective, dull, simple, clean)
1
practicable(adjective, simple, flat, clean)
1
practical(adjective, simple, flat, clean)
1
prose(adjective, simple, flat, clean)
1
routine(adjective, dull, simple, clean)
1
square(adjective, dull, simple, flat, clean)
1
stale(adjective, dull, simple, flat, clean)
1
trite(adjective, dull, simple, ordinary)
1
unexceptional(adjective, dull, simple, clean)
1
uninspiring(adjective, dull, simple, flat, clean)
1
workaday(adjective, simple, flat, clean)
1
yawn(adjective, simple, flat, clean)
0
matter-of- fact(expression, adjective, simple, flat, clean)
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ChicagoSmart Define. 2015. "lackluster thesaurus" https://smartdefine.org/lackluster/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, lackluster thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/lackluster/thesaurus/synonyms>.
MLASmart Define. "lackluster thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/lackluster/thesaurus/synonyms>