96 entries under important topic. ×

3
elemental(adjective, body, material, significant)
3
high(adjective, prominent, exalted)
3
influential(adjective, great, big, significant)
3
intrinsic(adjective, significant, original, essential)
3
primitive(adjective, body, material, significant)
3
serious(adjective, big, significant, substantial)
2
bottom(adjective, significant, original, essential)
2
capital(adjective, serious, essential, critical)
2
importunate(big, significant, substantial, serious)
2
life-or-death(adjective, essential, critical, basic)
2
weighty(big, significant, substantial, valuable)
1
axiological(adjective, significant, original, essential)
1
axiomatic(significant, original, basic, vital)
1
coal-and-ice(essential, critical, basic, fundamental)
1
constitutional(adjective, body, material, significant)
1
constitutive(original, capital, essential, critical)
1
first(adjective, significant, original, essential)
1
foremost(adjective, significant, capital, essential)
1
foundational(adjective, significant, original, essential)
1
grass-roots(adjective, significant, original, essential)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 23 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>