73 entries under fundamental topic. ×
| essential(adjective, importance, important, significant, original) | |
| root(noun, adjective, cause, original, basic) | |
| prime(importance, important, job, significant, original) | |
| basic(adjective, base, important, significant, last) | |
| original(noun, adjective, cause, important, new) | |
| primary(adjective, cause, base, importance, important) | |
| organic(adjective, important, significant, original, essential) | |
| basal(adjective, base, important, significant, last) | |
| underlying(adjective, base, important, significant, last) | |
| inherent(adjective, essential, basic, key) | |
| capital(importance, job, essential, key) | |
| cardinal(adjective, importance, important, significant, original) | |
| constitutional(adjective, important, significant, original, essential) | |
| ingrained(adjective, intrinsicality) | |
| natural(adjective, new, hot, raw, essential) | |
| primitive(adjective, cause, important, significant, original) | |
| innate(adjective, basic, intrinsicality) | |
| intrinsic(adjective, important, significant, original, essential) | |
| principal(adjective, great, importance, important, significant) | |
| superlative(adjective, job, essential, very best kind) |
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| APA | Smart Define. (2016). radical thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/radical/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "radical thesaurus" https://smartdefine.org/radical/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, radical thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/radical/thesaurus/synonyms>. |
| MLA | Smart Define. "radical thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/radical/thesaurus/synonyms> |