20
momentous(adjective, importance, important, main, extremely significant)
16
significant(adjective, importance, important, main, remarkable)
14
important(adjective, important, lively, significant, remarkable)
14
iconic(adjective, important)
13
notable(adjective, importance, main, remarkable, momentous)
11
consequential(adjective, importance, important, main, remarkable)
11
memorable(adjective, important, lively, significant, remarkable)
11
outstanding(adjective, importance, main, remarkable, momentous)
11
traditional(adjective, state, quality, important, fashion)
9
big(adjective, importance, important, main, extremely significant)
9
substantial(adjective, importance, important, main, extremely significant)
9
material(adjective, importance, important, main, extremely significant)
9
meaningful(adjective, importance, important, main, extremely significant)
9
serious(adjective, importance, important, main, extremely significant)
9
weighty(adjective, importance, main, extremely significant)
8
great(adjective, importance, main, extremely significant)
8
impressive(adjective, importance, main, extremely significant)
8
considerable(adjective, importance, important, main, extremely significant)
8
key(adjective, importance, important, main, extremely significant)
8
vital(adjective, importance, important, main, extremely significant)
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APASmart Define. (2016). historic thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/historic/thesaurus/synonyms
ChicagoSmart Define. 2016. "historic thesaurus" https://smartdefine.org/historic/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, historic thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/historic/thesaurus/synonyms>.
MLASmart Define. "historic thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/historic/thesaurus/synonyms>