| prescriptive | |
| proviso(adjective, required) | |
| quintessential(adjective, significant, essential, basic, vital) | |
| recumbent | |
| settled(expected, predictable, necessary, inexorable, undeniable) | |
| specified(adjective, significant, essential, basic, vital) | |
| stipulated(adjective, required) | |
| substantive | |
| sure(certain, definite, obvious, expected, necessary) | |
| ultimate | |
| unalterable(expected, predictable, necessary, inexorable, required) | |
| undeniable(adjective, definite, expected, predictable, necessary) | |
| unpreventable(expected, predictable, necessary, inexorable, undeniable) | |
| unwilling(adjective, affected, impulsive, strained, artificial) | |
| wanted(adjective, significant, essential, basic, vital) | |
| without appeal | |
| without choice | |
| without recourse(expression, expected, predictable, necessary, inexorable) | |
| actual(sound, certain, true, definite, unquestionable) | |
| affected(strained, unnatural) |
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| APA | Smart Define. (2015). obligatory thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/obligatory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "obligatory thesaurus" https://smartdefine.org/obligatory/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, obligatory thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/obligatory/thesaurus/synonyms>. |
| MLA | Smart Define. "obligatory thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/obligatory/thesaurus/synonyms> |