96 entries under important topic. ×

1
grave(adjective, great, big, significant)
1
heavy(big, significant, substantial, valuable)
1
leading(adjective, serious, capital, essential)
1
major(adjective, significant, original, essential)
1
meaningful(adjective, big, significant, substantial)
1
meat-and-potatoes(adjective, significant, original, essential)
1
name(essential, critical, basic, fundamental)
1
name-of-the-game(essential, critical, basic, fundamental)
1
nitty-gritty(adjective, original, essential, critical)
1
original(adjective, body, material, significant)
1
powerful(adjective, prominent, exalted)
1
primordial(adjective, significant, original, essential)
1
radical(adjective, significant, original, essential)
1
rudimentary(adjective, significant, original, essential)
1
salient(big, significant, substantial, valuable)
1
structural(material, natural, original, basic)
1
substratal(adjective, significant, original, essential)
1
substrative(adjective, significant, original, essential)
1
supporting(adjective, significant, original, essential)
1
sustaining(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>