60 entries under necessary topic. ×
| mandatory(adjective, right, significant, affected, essential) | |
| compulsory(adjective, sound, important, certain, true) | |
| requisite(adjective, appropriate, proper, significant, suitable) | |
| essential(adjective, important, significant, critical, basic) | |
| imperative(adjective, important, significant, essential, basic) | |
| required(adjective, right, significant, essential, basic) | |
| binding(adjective, sound, certain, true, significant) | |
| indispensable(adjective, important, significant, essential, critical) | |
| prerequisite(adjective, significant, essential, basic, vital) | |
| bounden(adjective, required, conclusive, obliged) | |
| unavoidable(adjective, certain, significant, essential, basic) | |
| inexorable(adjective, obvious, expected, predictable, compulsion) | |
| needful(adjective, significant, essential, basic, vital) | |
| vital(adjective, important, significant, essential, critical) | |
| inescapable(adjective, important, essential, vital, obvious) | |
| conclusive | |
| important(adjective, essential, vital) | |
| irrevocable(expected, predictable, inexorable, required) | |
| necessitous(essential, required, needed) | |
| all locked up(expression, expected, predictable, inexorable) |
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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> |