59 entries under original topic. ×
| principal(adjective, lead, important, head, significant) | |
| fundamental(noun, adjective, important, head, significant) | |
| cardinal(noun, adjective, lead, important, head) | |
| primary(adjective, lead, important, head, significant) | |
| crucial(adjective, important, significant, essential) | |
| major(adjective, lead, important, head, significant) | |
| prime(adjective, lead, important, head, significant) | |
| basic(adjective, important, head, significant, beginning) | |
| elementary(adjective, important, head, significant, beginning) | |
| underlying(adjective, important, significant, essential) | |
| basal(adjective, lead, important, head, significant) | |
| elemental(adjective, important, significant, essential) | |
| primordial(adjective, important, head, significant, beginning) | |
| rudimentary(adjective, important, head, significant, beginning) | |
| aboriginal(adjective, head, beginning, opening) | |
| intrinsic(adjective, important, significant, essential) | |
| predominant(adjective, important, outstanding, significant) | |
| primeval(adjective, head, beginning, opening) | |
| primitive(adjective, important, head, significant, beginning) | |
| requisite(important, significant, essential, critical) |
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| APA | Smart Define. (2016). key thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/key/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "key thesaurus" https://smartdefine.org/key/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, key thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/key/thesaurus/synonyms>. |
| MLA | Smart Define. "key thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/key/thesaurus/synonyms> |