106 entries under essential topic. ×

6
urgent(adjective, clear, tough, severe, big)
5
heavy(adjective, great, tough, severe, big)
5
main(adjective, good, superior, unusual, important)
4
basic(adjective, important, original, critical)
4
integral(adjective, importance, important, original, serious)
4
prime(adjective, good, important, original)
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)
2
mean(verb, adjective, important, basic)
2
name(strong, important, powerful, critical)
2
paramount(adjective, good, important, original, serious)
2
radical(adjective, great, important, original, serious)
1
all-important(adjective, important, serious, critical)
1
axiological(adjective, important, original, basic)
1
basal(adjective, important, original, basic)
1
bottom(adjective, important, original, basic)
1
bottom-line(adjective, important, original, critical)
1
coal-and-ice(important, critical, fundamental, imperative)
10 years ago|34k views|share |citing 
APASmart Define. (2016). significant thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/significant/thesaurus/synonyms
ChicagoSmart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, significant thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>.
MLASmart Define. "significant thesaurus" 4 March 2016. Web. 24 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms>