| false(affected, strained, unnatural) | |
| fit(appropriate, suitable, expected, fitting, due) | |
| fitting(appropriate, suitable, expected, due, anticipated) | |
| for sure(expression, sound, certain, true, definite) | |
| foreseeable(expected, predictable, unavoidable) | |
| fundamental(adjective, significant, essential, basic, vital) | |
| habitual(unwilling, compulsory) | |
| hackney | |
| haemostatic | |
| have | |
| high-priority | |
| idiopathic | |
| imperatorial | |
| impose | |
| impulsive(unwilling, compulsory) | |
| incontestable | |
| incontrovertible | |
| indispensables | |
| indissoluble(necessary, required, conclusive) | |
| indivertible |
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| APA | Smart Define. (2015). obligatory thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/obligatory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "obligatory thesaurus" https://smartdefine.org/obligatory/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, obligatory thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/obligatory/thesaurus/synonyms>. |
| MLA | Smart Define. "obligatory thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/obligatory/thesaurus/synonyms> |