Synonyms|29Antonyms|0|Broader|0Narrower|0Related|0

28 entries under significant topic. ×

1
big(important, historic)
1
chips are down(expression, idiom, important, historic)
1
considerable(important, historic)
1
decisive(important, historic)
1
earth-shaking(important, historic)
1
earth-shattering(important, historic)
1
epochal(important, historic)
1
eventful(important, historic)
1
far-reaching(important, historic)
1
fateful(important, historic)
1
grave(important, historic)
1
heavy(important, historic)
1
heavy number(expression, important, historic)
1
historic
1
material(important, historic)
1
memorable(important, historic)
1
of moment(expression, important, historic)
1
outstanding(important, historic)
1
substantial(important, historic)
0
consequential(important, historic)
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APASmart Define. (1970). important serious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/important_serious/thesaurus/synonyms
ChicagoSmart Define. 1970. "important serious thesaurus" https://smartdefine.org/important_serious/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 1970, important serious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/important_serious/thesaurus/synonyms>.
MLASmart Define. "important serious thesaurus" 1 January 1970. Web. 28 September 2026. <https://smartdefine.org/important_serious/thesaurus/synonyms>