164 entries under significant topic. ×
| indispensable(adjective, important, original, serious) | |
| large(adjective, big, substantial, valuable) | |
| original(adjective, order, body, material, heavy) | |
| remarkable(adjective, extraordinary, unusual, important, wonderful) | |
| requisite(adjective, important, original, capital) | |
| super(noun, adjective, good, bad, tough) | |
| bulky(large, considerable) | |
| commanding(adjective, free, top, fine, superior) | |
| compelling(adjective, important, serious, essential) | |
| consequential(large, considerable) | |
| considerable(big, substantial, large, valuable) | |
| distinguished(adjective, bad, great, excellent, fine) | |
| famous(adjective, bad, great, excellent, superior) | |
| heavy(noun, adjective, order, advance, start) | |
| illustrious(adjective, excellent, important, famous) | |
| imperative(adjective, big, important, substantial) | |
| impressive(adjective, bad, great, excellent, fine) | |
| integral(adjective, body, material, important) | |
| intrinsic(adjective, important, original, essential) | |
| needful(adjective, important, original, capital) |
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| APA | Smart Define. (2016). principal thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/principal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, principal thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>. |
| MLA | Smart Define. "principal thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms> |