| compelling(adjective, significant, essential, basic, vital) | |
| constraining(adjective, required, obligatory) | |
| demanded | |
| needful(adjective, set, significant, essential, basic) | |
| vital(adjective, set, significant, essential, basic) | |
| enforced(affected, strained, unnatural, required, obligatory) | |
| imposed | |
| inescapable(adjective, obvious, required, inevitable) | |
| prescribed | |
| pressing(adjective, significant, essential, basic, vital) | |
| commanded | |
| compulsatory(adjective, necessary, commanding, required, obligatory) | |
| crucial(adjective, significant, essential, basic, vital) | |
| exigent(adjective, significant, essential, basic, vital) | |
| hard-and-fast(adjective, strict) | |
| incumbent | |
| must(adjective, required) | |
| official | |
| peremptory(adjective, affected, strained, commanding, unnatural) | |
| urgent(adjective, significant, essential, basic, vital) |
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| APA | Smart Define. (2015). mandatory thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/mandatory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mandatory thesaurus" https://smartdefine.org/mandatory/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, mandatory thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/mandatory/thesaurus/synonyms>. |
| MLA | Smart Define. "mandatory thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/mandatory/thesaurus/synonyms> |