95 entries under original topic. ×
| central(adjective, important, significant, essential) | |
| indispensable(adjective, characteristic, important, significant, natural) | |
| initial(adjective, start, simple, plain, head) | |
| critical(adjective, severe, important, essential) | |
| crucial(adjective, important, significant, essential) | |
| deep-seated(adjective, characteristic, natural, essential) | |
| requisite(noun, adjective, important, want, significant) | |
| integral(adjective, characteristic, body, material, important) | |
| important(adjective, significant, essential, critical) | |
| primordial(adjective, important, head, significant, beginning) | |
| aboriginal(adjective, pure, head, beginning) | |
| beginning(adjective, start, simple, plain, head) | |
| bottom(noun, adjective, important, significant) | |
| leading(adjective, important, head, significant, beginning) | |
| paramount(adjective, important, significant, essential) | |
| primeval(adjective, wild, head, beginning) | |
| root(noun, adjective, drop, part, material) | |
| constitutive(adjective, important, serious, essential) | |
| deep(adjective, primary) | |
| earliest(adjective, simple, top, rough, opening) |
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| APA | Smart Define. (2015). basic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/basic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "basic thesaurus" https://smartdefine.org/basic/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, basic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/basic/thesaurus/synonyms>. |
| MLA | Smart Define. "basic thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/basic/thesaurus/synonyms> |