73 entries under fundamental topic. ×
| thoroughgoing(adjective, basic) | |
| vital(adjective, great, importance, important, significant) | |
| central(adjective, important, significant, original, essential) | |
| chief(importance, important, significant, essential) | |
| deep-seated(adjective, original, basic, primary) | |
| elementary(adjective, important, significant, original, essential) | |
| foundational(adjective, base, important, significant, last) | |
| profound(adjective, basic) | |
| bottom(adjective, important, significant, original, essential) | |
| elemental(adjective, important, significant, original, essential) | |
| main(importance, important, significant, original, essential) | |
| utmost(adjective, great, wonderful, amazing, essential) | |
| crucial(adjective, great, important, significant, original) | |
| primal(adjective, basic) | |
| greatest(adjective, essential, supreme) | |
| key(adjective, important, significant, original, essential) | |
| most(adjective, essential, supreme) | |
| native(adjective, basic) | |
| transcendental(adjective, essential, supreme) | |
| ultimate(adjective, essential, basic, supreme) |
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| APA | Smart Define. (2016). radical thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/radical/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "radical thesaurus" https://smartdefine.org/radical/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, radical thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/radical/thesaurus/synonyms>. |
| MLA | Smart Define. "radical thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/radical/thesaurus/synonyms> |