96 entries under important topic. ×

44
required(adjective, right, capital, essential)
40
essential(noun, adjective, body, material, big)
33
requisite(noun, adjective, want, need)
29
indispensable(adjective, significant, original, essential)
28
vital(adjective, body, material, big)
23
fundamental(noun, adjective, body, material)
21
imperative(adjective, essential, critical, vital)
20
prerequisite(noun, adjective, want, need)
18
urgent(adjective, substantial, valuable, essential)
17
crucial(adjective, big, significant, original)
17
needful(adjective, set, original, capital)
17
organic(adjective, significant, natural, animate)
15
needed(adjective, essential, critical, verb)
13
basic(noun, adjective, body, material)
12
key(adjective, significant, original, essential)
11
cardinal(noun, adjective, significant, original)
11
compelling(adjective, reasonable, sensible, serious)
11
exigent(adjective, substantial, serious, valuable)
10
main(adjective, significant, original, capital)
10
pressing(adjective, substantial, serious, essential)
10 years ago|19k views|share |citing 
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>