| backward(adjective, knowledge) | |
| bestial | |
| blunt | |
| brutal(adjective, strong, severe, rough, intense) | |
| bygone(adjective, last, original, odd, old) | |
| cardinal(adjective, important, head, significant, beginning) | |
| cave dweller(expression, idiom) | |
| caveman | |
| central(adjective, top, important, significant, original) | |
| classic | |
| clumsy | |
| connate(adjective, cause, original, basic, absolute) | |
| constitutional(adjective, body, material, important, significant) | |
| constitutive(important, significant, original, basic, vital) | |
| crucial(adjective, important, significant, original, essential) | |
| demode(adjective, last, original, odd, old) | |
| erstwhile(last, original, old, past, venerable) | |
| foundational(adjective, simple, plain, important, significant) | |
| genetic | |
| gut(intuitive, instinctual) |
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| APA | Smart Define. (2015). primitive thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/primitive/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "primitive thesaurus" https://smartdefine.org/primitive/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, primitive thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/primitive/thesaurus/synonyms>. |
| MLA | Smart Define. "primitive thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/primitive/thesaurus/synonyms> |