| compelling(adjective, important, significant, serious, essential) | |
| entailed | |
| fundamental(adjective, important, significant, capital, essential) | |
| imperious(adjective, commanding, obligatory, authoritative, domineering) | |
| imposed | |
| lacked(verb, lacked) | |
| mandated | |
| perfect(adjective, correct, flawless, faultless, textbook) | |
| requested | |
| standard | |
| staple | |
| stipulated(verb, adjective) | |
| require | |
| absolute(flawless, faultless, textbook) | |
| bounden(necessary, obligatory, conclusive) | |
| called-for | |
| cardinal(adjective, important, significant, capital, essential) | |
| carried | |
| central | |
| certain(correct, proper, suitable, flawless, obvious) |
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| APA | Smart Define. (2015). required thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/required/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "required thesaurus" https://smartdefine.org/required/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, required thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/required/thesaurus/synonyms>. |
| MLA | Smart Define. "required thesaurus" 3 November 2015. Web. 21 September 2026. <https://smartdefine.org/required/thesaurus/synonyms> |