53 entries under required topic. ×

44
required(adjective, right, important, capital, essential)
40
essential(noun, adjective, body, material, big)
33
requisite(noun, adjective, important, want, need)
29
indispensable(adjective, important, significant, original, essential)
28
vital(adjective, body, material, big, important)
23
obligatory(adjective, sound, right, essential, obligation)
23
fundamental(noun, adjective, body, material, important)
21
imperative(adjective, important, essential, critical, vital)
21
compulsory(adjective, cruel, essential, pitiless, obligation)
20
prerequisite(noun, adjective, important, want, need)
17
crucial(adjective, big, important, significant, original)
17
needful(adjective, set, important, original, capital)
16
mandatory(adjective, right, essential, obvious, obligation)
15
inevitable(adjective, certain, regular, obvious, expected)
15
needed(adjective, essential, important, critical, verb)
13
basic(noun, adjective, body, material, important)
12
inescapable(adjective, cruel, pitiless, unrelenting, inexorable)
11
binding(adjective, sound, essential, inexorable)
11
cardinal(noun, adjective, important, significant, original)
10
involuntary(adjective, inevitable)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 22 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>