82 entries under significant topic. ×

1
of substance(expression, big, substantial, valuable)
1
original(adjective, body, material, important)
1
ponderous(big, substantial, valuable, vital)
1
primordial(adjective, important, original, essential)
1
radical(adjective, important, original, essential)
1
rudimentary(adjective, important, original, essential)
1
salient(big, important, substantial, valuable)
1
signal(vital, imperative)
1
something(big, substantial, valuable, vital)
1
standout(big, substantial, valuable, vital)
1
substantial(adjective, great, big, large)
1
substratal(adjective, important, original, essential)
1
substrative(adjective, important, original, essential)
1
supporting(adjective, important, original, essential)
1
sustaining(adjective, important, original, essential)
1
theoretical(adjective, important, original, essential)
1
underived(adjective, important, original, essential)
1
valuable(adjective, great, big, substantial)
0
bottom line(expression, important, essential, basic)
0
exceptional(big, substantial, valuable, vital)
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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>