76 entries under basic topic. ×

5
main(adjective, good, superior, unusual, important)
4
integral(adjective, importance, important, original, serious)
4
prime(adjective, good, important, original, essential)
3
first(adjective, superior, unusual, important, rank)
2
deep(adjective, good, strong, tough, severe)
2
imperative(adjective, big, important, determined, substantial)
2
indispensable(adjective, important, original, serious, essential)
2
mean(verb, adjective, important, essential)
2
paramount(adjective, good, important, original, serious)
2
radical(adjective, great, important, original, serious)
1
all-important(adjective, important, serious, essential, critical)
1
axiological(adjective, important, original, essential)
1
axiomatic(important, original, vital, major)
1
basal(adjective, important, original, essential)
1
bottom(adjective, important, original, essential)
1
bottom-line(adjective, important, original, essential, critical)
1
constitutional(adjective, important, original, essential)
1
elemental(adjective, important, original, essential)
1
elementary(adjective, important, original, essential)
1
exigent(adjective, great, big, heavy, important)
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APASmart Define. (2016). significant thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 22 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>