140 entries under essential topic. ×

11
binding(adjective, sound, inexorable, required)
11
cardinal(noun, adjective, important, significant, original)
11
compelling(adjective, reasonable, sensible, important, serious)
11
exigent(adjective, important, substantial, serious, valuable)
10
main(adjective, important, significant, original, capital)
10
must(noun, adjective, right, want, need)
10
need(noun, verb, want, certainty)
10
pressing(adjective, important, substantial, serious)
10
principal(adjective, body, material, big, important)
10
requirement(noun, want, need, certainty)
10
significant(adjective, big, important, original, substantial)
10
wanted(adjective, important, capital, vital)
8
chief(adjective, big, important, significant, substantial)
8
critical(adjective, big, important, significant, substantial)
7
prime(adjective, body, material, important, significant)
6
de rigueur(expression, adjective, right, required)
6
decisive(adjective, important, substantial, valuable)
6
momentous(adjective, important, substantial, valuable)
6
paramount(adjective, important, significant, original, substantial)
5
central(adjective, important, significant, original)
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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>