47 entries under obligatory topic. ×
| significant(adjective, big, important, original, substantial) | |
| chief(adjective, big, important, significant, substantial) | |
| prime(adjective, body, material, important, significant) | |
| incumbent | |
| de rigueur(expression, adjective, right, essential, required) | |
| paramount(adjective, important, significant, original, substantial) | |
| conclusive(adjective, demonstration, decisive, required) | |
| constraining(adjective, required) | |
| elementary(adjective, easy, important, significant, original) | |
| called for(verb, expression, phrasal verb, right, essential) | |
| bottom-line(adjective, important, significant, original, essential) | |
| bounden(required, conclusive) | |
| enforced(required, compulsory, mandatory) | |
| fixed(expected, predictable, inexorable, required) | |
| imperious(required, compulsory, mandatory) | |
| incumbent on(expression, adjective, essential, required) | |
| prescribed(adjective, expected, predictable, inexorable) | |
| suitable(adjective, wanted, needed, compulsory) | |
| right(noun, adjective, want, essential, obligation) | |
| unalterable(expected, predictable, inexorable, required) |
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| APA | Smart Define. (2015). necessary thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, necessary thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>. |
| MLA | Smart Define. "necessary thesaurus" 2 November 2015. Web. 27 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms> |