83 entries under primary topic. ×
| requisite(adjective, important, significant, original, capital) | |
| unparalleled(adjective, bad, tough, top, perfect) | |
| unrivaled(adjective, bad, tough, top, perfect) | |
| deep(adjective, original, basic) | |
| integral(adjective, body, material, important, significant) | |
| intrinsic(adjective, important, significant, original, essential) | |
| primitive(adjective, body, material, important, significant) | |
| unequaled(adjective, bad, tough, top, perfect) | |
| axiological(adjective, important, significant, original, essential) | |
| axiomatic(important, significant, original, basic, vital) | |
| bottom(adjective, important, significant, original, essential) | |
| bottom-line(adjective, important, significant, original, essential) | |
| deep-seated(adjective, original, basic, absolute, fundamental) | |
| foundational(adjective, important, significant, original, essential) | |
| grass-roots(adjective, important, significant, original, essential) | |
| meat-and-potatoes(adjective, important, significant, original, essential) | |
| primordial(adjective, important, significant, original, essential) | |
| substratal(adjective, important, significant, original, essential) | |
| substrative(adjective, important, significant, original, essential) | |
| supporting(adjective, important, significant, original, essential) |
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| APA | Smart Define. (2016). principal thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/principal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, principal thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>. |
| MLA | Smart Define. "principal thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms> |