164 entries under significant topic. ×
| outstanding(adjective, bad, great, tough, top) | |
| vital(adjective, body, great, importance, material) | |
| elementary(adjective, important, original, essential) | |
| momentous(adjective, good, bad, great, excellent) | |
| necessary(adjective, body, material, big, important) | |
| radical(adjective, great, importance, important) | |
| crucial(adjective, great, big, important) | |
| great(adjective, bad, excellent, superior, big) | |
| substantial(adjective, big, important, large) | |
| big(adjective, important, substantial, large) | |
| elemental(adjective, body, material, important) | |
| eminent(adjective, good, bad, great, excellent) | |
| underlying(adjective, important, original, essential) | |
| basal(adjective, body, lead, material, important) | |
| noteworthy(adjective, extraordinary, unusual, important, wonderful) | |
| rudimentary(adjective, important, original, essential) | |
| salient(adjective, big, important, wonderful, exceptional) | |
| conspicuous(adjective, great, big, wonderful, exceptional) | |
| constitutional(adjective, body, material, important) | |
| excellent(adjective, bad, great, fine, superior) |
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| APA | Smart Define. (2016). principal thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/principal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, principal thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>. |
| MLA | Smart Define. "principal thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms> |