| appropriate(suitable, fitting, compulsory, mandatory) | |
| artificial(affected, strained, unnatural) | |
| astrictive | |
| automatic(unwilling, compulsory) | |
| basic(adjective, significant, essential, vital, fundamental) | |
| becoming(appropriate, suitable, expected, fitting, due) | |
| beyond doubt(expression, sound, certain, true, definite) | |
| blind(forced, unwilling, compulsory) | |
| bottom-line(adjective, significant, essential, basic, vital) | |
| bottom line(expression, fundamental, decisive, imperative) | |
| bound(affected, strained, unnatural) | |
| bound by(verb, phrasal verb, duty) | |
| cabined | |
| called-for | |
| called for(expression, right, essential, necessary, compulsory) | |
| cardinal(adjective, significant, essential, basic, vital) | |
| central | |
| chargeable | |
| chargeable on(verb, phrasal verb, duty) | |
| cliche |
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| APA | Smart Define. (2015). obligatory thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/obligatory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "obligatory thesaurus" https://smartdefine.org/obligatory/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, obligatory thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/obligatory/thesaurus/synonyms>. |
| MLA | Smart Define. "obligatory thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/obligatory/thesaurus/synonyms> |