| elementary(adjective, easy, important, significant, original) | |
| fatal | |
| fateful(expected, predictable, inexorable, undeniable, unavoidable) | |
| imminent(adjective, certain, expected, predictable, inexorable) | |
| ineludible(adjective, certain, obvious, expected, inexorable) | |
| integral(adjective, body, material, important, significant) | |
| irresistible(expected, demonstration, predictable, inexorable, undeniable) | |
| jakes(noun, receptacle) | |
| necessitous(adjective, important, capital, essential, vital) | |
| predestined | |
| predetermined | |
| primary(adjective, body, material, big, important) | |
| quintessential(adjective, essential, required, needed) | |
| substantive | |
| want(noun, verb, need, essential, certainty) | |
| called for(verb, expression, phrasal verb, right, essential) | |
| all-important(adjective, essential, required, needed) | |
| apodictic | |
| automatic(adjective, regular) | |
| backhouse |
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| APA | Smart Define. (2015). necessary thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, necessary thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>. |
| MLA | Smart Define. "necessary thesaurus" 2 November 2015. Web. 22 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms> |