124 entries under significant topic. ×

6
tough(adjective, strong, intense, energetic, important)
5
exigent(adjective, big, heavy, important)
5
prerequisite(adjective, set, right, important)
5
underlying(adjective, important, original, essential)
4
constitutional(adjective, body, material, important)
4
mandatory(adjective, set, essential, basic)
4
obligatory(adjective, important, essential, critical)
3
elementary(adjective, top, important, original)
3
foremost(adjective, importance, big, important)
3
heavy(adjective, informal, big, important)
3
signal(adjective, important, imperative)
2
acute(adjective, severe, heavy, important)
2
all-important(adjective, important, serious, essential)
2
dangerous(great, severe, important, serious)
2
first(adjective, top, important, original)
2
primitive(adjective, body, material, important)
2
quintessential(adjective, important, essential, basic)
2
rudimentary(adjective, important, original, essential)
2
something(big, substantial, valuable, imperative)
2
wanted(adjective, important, serious, essential)
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APASmart Define. (2015). vital thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/vital/thesaurus/synonyms
ChicagoSmart Define. 2015. "vital thesaurus" https://smartdefine.org/vital/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, vital thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/vital/thesaurus/synonyms>.
MLASmart Define. "vital thesaurus" 2 November 2015. Web. 28 September 2026. <https://smartdefine.org/vital/thesaurus/synonyms>