82 entries under significant topic. ×

4
basal(adjective, body, material, important)
4
underlying(adjective, important, original, essential)
3
bottom-line(adjective, important, original, essential)
3
elemental(adjective, body, material, important)
3
influential(adjective, great, big, important)
3
intrinsic(adjective, important, original, essential)
3
primitive(adjective, body, material, important)
3
serious(adjective, big, important, substantial)
2
big(adjective, great, substantial, large)
2
bottom(adjective, important, original, essential)
2
considerable(big, substantial, valuable, vital)
2
importunate(big, important, substantial, serious)
2
material(adjective, big, substantial, valuable)
2
relevant(adjective, clear, sound, reasonable, sensible)
2
weighty(big, important, substantial, valuable)
1
axiological(adjective, important, original, essential)
1
axiomatic(important, original, basic, vital)
1
big-league(vital, imperative)
1
conspicuous(vital, imperative)
1
constitutional(adjective, body, material, important)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 24 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>