75 entries under essential topic. ×
| elementary(adjective, important, significant, original) | |
| foundational(adjective, base, important, significant, last) | |
| primordial(adjective, cause, important, significant, original) | |
| bottom(adjective, important, significant, original) | |
| elemental(adjective, important, significant, original) | |
| main(importance, important, significant, original) | |
| paramount(adjective, importance, important, significant, original) | |
| rudimentary(adjective, important, significant, original) | |
| utmost(adjective, great, wonderful, amazing) | |
| absolute(adjective, severe, harsh, exceptional) | |
| crucial(adjective, great, important, significant, original) | |
| major(adjective, great, important, significant, original) | |
| greatest(adjective, fundamental, supreme) | |
| important(adjective, great, significant, original, serious) | |
| integral(adjective, important, significant, original) | |
| key(adjective, important, significant, original) | |
| most(adjective, fundamental, supreme) | |
| significant(adjective, great, important, original, serious) | |
| transcendental(adjective, fundamental, supreme) | |
| ultimate(adjective, basic, fundamental, supreme) |
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| APA | Smart Define. (2016). radical thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/radical/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "radical thesaurus" https://smartdefine.org/radical/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, radical thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/radical/thesaurus/synonyms>. |
| MLA | Smart Define. "radical thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/radical/thesaurus/synonyms> |