124 entries under significant topic. ×

1
theoretical(adjective, important, original, essential)
1
underived(adjective, important, original, essential)
1
valuable(big, substantial, precious, imperative)
0
binding(adjective, essential, basic, required)
0
bottom line(expression, important, essential, basic)
0
chips are down(expression, idiom, important, historic)
0
de rigueur(expression, adjective, essential, basic)
0
definite(adjective, pleasant, critical, key)
0
definitive(adjective, last, critical, key)
0
epochal(important, historic)
0
eventful(important, historic)
0
exceptional(big, substantial, valuable, imperative)
0
expedient(adjective, essential, basic, necessary)
0
final(adjective, last, critical, key)
0
grievous(adjective, great, heavy, important)
0
heavy number(expression, important, historic)
0
important serious(expression, important, historic)
0
incumbent on(expression, adjective, essential, basic)
0
meat and potatoes(expression, idiom, important)
0
memorable(important, historic)
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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>