81 entries under significant topic. ×
| necessary(adjective, important, original, essential) | |
| crucial(adjective, important, original, essential) | |
| indispensable(adjective, important, original, essential) | |
| overriding(adjective, important, serious, prime) | |
| pivotal(adjective, important, serious, basic) | |
| radical(adjective, importance, important, original) | |
| organic(adjective, important, original, basic) | |
| elementary(adjective, important, head, beginning) | |
| rudimentary(adjective, important, head, beginning) | |
| basal(adjective, lead, important, head) | |
| ruling(adjective, important, original, serious) | |
| elemental(adjective, important, original, essential) | |
| needful(adjective, important, capital, essential) | |
| outstanding(adjective, important, essential, prominent) | |
| primordial(adjective, important, head, beginning) | |
| requisite(adjective, important, original, essential) | |
| bottom-line(adjective, important, original, essential) | |
| constitutional(adjective, important, original, basic) | |
| focal(important, key, main, chief) | |
| integral(important, original, essential, critical) |
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| APA | Smart Define. (2015). cardinal thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/cardinal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "cardinal thesaurus" https://smartdefine.org/cardinal/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, cardinal thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/cardinal/thesaurus/synonyms>. |
| MLA | Smart Define. "cardinal thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/cardinal/thesaurus/synonyms> |