50 entries under fundamental topic. ×
| nitty-gritty(important, essential, critical, basic) | |
| quintessential(adjective, significant, essential, basic, vital) | |
| significant(adjective, important, essential, critical, basic) | |
| specified(adjective, significant, essential, basic, vital) | |
| underlined(important, essential, critical, basic) | |
| necessitous(important, capital, essential, vital) | |
| all-important(adjective, significant, essential, basic, vital) | |
| bottom line(expression, decisive, imperative) | |
| name of game(expression, adjective, idiom, significant, essential) | |
| prime(adjective, significant, essential, basic, vital) |
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| APA | Smart Define. (2015). required thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/required/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "required thesaurus" https://smartdefine.org/required/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, required thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/required/thesaurus/synonyms>. |
| MLA | Smart Define. "required thesaurus" 3 November 2015. Web. 28 September 2026. <https://smartdefine.org/required/thesaurus/synonyms> |