164 entries under significant topic. ×
| extraordinary(unusual, exceptional, special, large) | |
| far-reaching(big, substantial, valuable, vital) | |
| fine(adjective, top, excellent, superior, important) | |
| foundational(adjective, important, original, essential) | |
| front-page(big, substantial, valuable, vital) | |
| grass-roots(adjective, important, original, essential) | |
| importunate(big, substantial, valuable, vital) | |
| influential(great, important, usual, serious) | |
| lofty(adjective, free, fine, important) | |
| major-league(great, important, large, serious) | |
| marked(adjective, great, extraordinary, big, unusual) | |
| material(big, substantial, large, valuable) | |
| mattering much(expression, big, substantial, valuable) | |
| meat-and-potatoes(adjective, important, original, essential) | |
| needed(adjective, important, capital, essential) | |
| of moment(expression, big, substantial, valuable) | |
| of note(expression, big, substantial, valuable) | |
| of substance(expression, big, substantial, valuable) | |
| ponderous(big, substantial, valuable, vital) | |
| popular(adjective, good, important, powerful) |
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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> |