| due(adjective, appropriate, proper, suitable, expected) | |
| dutiful(adjective, obedient, unthinking, automatic, well-behaved) | |
| important(adjective, essential, vital, necessary) | |
| irrevocable(expected, predictable, necessary, inexorable, required) | |
| necessitous(essential, necessary, required, needed) | |
| obligate | |
| obligation | |
| absolute | |
| all-important(adjective, significant, essential, basic, vital) | |
| all locked up(expression, expected, predictable, necessary, inexorable) | |
| assured(expected, predictable, necessary, inexorable, undeniable) | |
| begrudging(affected, strained, forced, unwilling, unnatural) | |
| behooving | |
| certain(definite, obvious, expected, predictable, unquestionable) | |
| chief(adjective, significant, essential, basic, vital) | |
| choiceless | |
| coactive | |
| commanding | |
| decided(expected, predictable, necessary, inexorable, authoritative) | |
| decreed(expected, predictable, necessary, inexorable, undeniable) |
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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> |