55 entries under obligatory topic. ×
| basic(adjective, important, significant, essential, critical) | |
| compelling(adjective, important, significant, serious, essential) | |
| fundamental(adjective, important, significant, capital, essential) | |
| imperious(adjective, commanding, authoritative, domineering) | |
| bounden(necessary, conclusive) | |
| cardinal(adjective, important, significant, capital, essential) | |
| chief(adjective, important, significant, serious, capital) | |
| compulsatory(adjective, commanding, authoritative, domineering) | |
| conclusive | |
| constraining | |
| decisive(adjective, important, significant, essential, critical) | |
| enforced(verb, adjective, compulsory, mandatory) | |
| exigent(adjective, important, significant, serious, essential) | |
| irrevocable(necessary, conclusive) | |
| principal(adjective, important, significant, serious, capital) | |
| unavoidable(adjective, certain, significant, essential, sure) | |
| bottom-line(adjective, important, significant, essential, critical) | |
| elementary(adjective, significant, essential, basic, vital) | |
| expedient(adjective, significant, essential, basic, vital) | |
| incumbent on(expression, adjective, significant, essential, basic) |
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| APA | Smart Define. (2015). required thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/required/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "required thesaurus" https://smartdefine.org/required/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, required thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/required/thesaurus/synonyms>. |
| MLA | Smart Define. "required thesaurus" 3 November 2015. Web. 26 September 2026. <https://smartdefine.org/required/thesaurus/synonyms> |