83 entries under substantial topic. ×
| considerable(adjective, importance, big, significant) | |
| foremost(adjective, importance, big, important, significant) | |
| urgent(adjective, severe, big, important, significant) | |
| major(adjective, important, significant, original) | |
| pressing(adjective, big, important, significant) | |
| valid(adjective, solid, physical, material, true) | |
| decisive(adjective, severe, big, important, significant) | |
| right(noun, adjective, solid, physical, material) | |
| valuable(adjective, big, significant, useful) | |
| exigent(adjective, big, important, significant) | |
| heavy(adjective, big, important, significant) | |
| determining(big, important, significant, serious) | |
| distinguished(adjective, big, important, significant) | |
| doozie(big, important, significant, large) | |
| dynamite(big, important, significant, large) | |
| extensive(big, significant, large, valuable) | |
| fab(big, important, significant, large) | |
| far-reaching(big, significant, valuable, vital) | |
| fat(big, important, significant, large) | |
| front-page(big, significant, valuable, vital) |
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| APA | Smart Define. (2016). essential thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/essential/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "essential thesaurus" https://smartdefine.org/essential/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, essential thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/essential/thesaurus/synonyms>. |
| MLA | Smart Define. "essential thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/essential/thesaurus/synonyms> |