| nitty-gritty(adjective, original, basic, absolute, fundamental) | |
| nub(adjective, original, basic, absolute, fundamental) | |
| nuclear(material, natural, basic, living, functional) | |
| number one(adjective, lead, head, master, boss) | |
| of the essence(expression, idiom) | |
| paramount(important, original, serious, basic, prime) | |
| plasmic(material, natural, basic, living, functional) | |
| prefatory(simple, straightforward, basic, uncomplicated) | |
| pregnant | |
| preliminary(simple, straightforward, basic, uncomplicated) | |
| premier(adjective, lead, head, master, boss) | |
| premiere(adjective, lead, head, master, boss) | |
| primeval | |
| primo(simple, straightforward, basic, uncomplicated) | |
| pristine | |
| protogenic | |
| pure(adjective, pure) | |
| purebred(adjective, pure) | |
| requisite(important, original, essential, basic, vital) | |
| rock-bottom(base, last) |
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| APA | Smart Define. (2015). basal thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/basal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "basal thesaurus" https://smartdefine.org/basal/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, basal thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/basal/thesaurus/synonyms>. |
| MLA | Smart Define. "basal thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/basal/thesaurus/synonyms> |