Synonyms|215Antonyms|67|Broader|2Narrower|0Related|580

16 entries under significant topic. ×

14
important(adjective, important, lively, remarkable)
11
memorable(adjective, important, lively, remarkable)
6
crucial(adjective, great, important, lively)
4
eventful(adjective, great, important, lively)
3
critical(adjective, great, important, lively)
2
epochal(adjective, important)
1
chips are down(expression, idiom, important)
1
decisive(great, extraordinary, important, lively)
1
earth-shattering
1
far-reaching
1
heavy(great, extraordinary, important, outstanding)
1
heavy number(expression, important)
1
important serious(expression, important)
1
of moment(expression, important)
1
pivotal
0
earth-shaking
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APASmart Define. (2016). historic thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/historic/thesaurus/synonyms
ChicagoSmart Define. 2016. "historic thesaurus" https://smartdefine.org/historic/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, historic thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/historic/thesaurus/synonyms>.
MLASmart Define. "historic thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/historic/thesaurus/synonyms>