| basal(adjective, body, material, important, significant) | |
| bathroom | |
| expedient(adjective, essential, required, wanted, needed) | |
| good(wanted, needed) | |
| inerrant(adjective, certain, inevitable) | |
| inevasible(adjective, certain, obvious, inevitable, inescapable) | |
| lavatory | |
| logical(adjective, clear, sound, reasonable, rational) | |
| of the essence(expression, adjective, idiom, important, essential) | |
| sine qua non(noun, expression, idiom, need, essential) | |
| underlying(adjective, important, significant, original, essential) | |
| absolute | |
| bottom-line(adjective, important, significant, original, essential) | |
| bound | |
| bounden(required, obligatory, conclusive) | |
| called-for(adjective, important, serious, essential, critical) | |
| consequential(adjective, important, prominent, exalted) | |
| determinate | |
| duty(noun, want, essential, obligation, requirement) | |
| elemental(adjective, body, material, important, significant) |
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| APA | Smart Define. (2015). necessary thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, necessary thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>. |
| MLA | Smart Define. "necessary thesaurus" 2 November 2015. Web. 23 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms> |