140 entries under essential topic. ×
| required(adjective, right, important, capital) | |
| requisite(noun, adjective, important, want, need) | |
| indispensable(adjective, important, significant, original) | |
| vital(adjective, body, material, big, important) | |
| obligatory(adjective, sound, right, obligation) | |
| fundamental(noun, adjective, body, material, important) | |
| imperative(adjective, important, critical, vital) | |
| compulsory(adjective, cruel, pitiless, obligation) | |
| important(adjective, significant, original, substantial, serious) | |
| prerequisite(noun, adjective, important, want, need) | |
| unavoidable(adjective, regular, obvious, bound) | |
| urgent(adjective, important, substantial, valuable) | |
| crucial(adjective, big, important, significant, original) | |
| needful(adjective, set, important, original, capital) | |
| organic(adjective, important, significant, natural, animate) | |
| necessity(noun, want, need, basic) | |
| mandatory(adjective, right, obvious, obligation) | |
| needed(adjective, important, critical, verb) | |
| basic(noun, adjective, body, material, important) | |
| key(adjective, important, significant, original) |
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| APA | Smart Define. (2015). necessary thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, necessary thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>. |
| MLA | Smart Define. "necessary thesaurus" 2 November 2015. Web. 21 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms> |