142 entries under substantial topic. ×
| super(adjective, good, extraordinary, big, unusual) | |
| actual | |
| ad rem(expression, important, serious, related) | |
| clear-cut(sharp, definite, considerable, cutting) | |
| definite(adjective, superior, energetic, big, unusual) | |
| determining(big, important, serious, valuable) | |
| doozie(big, important, outstanding, large) | |
| dynamite(big, important, large) | |
| exigent(adjective, great, big, heavy, important) | |
| fab(big, important, large) | |
| fat(adjective, big, heavy, important) | |
| front-page(big, important, valuable, vital) | |
| hefty(adjective, big, heavy, large) | |
| immanent | |
| interesting(adjective, outstanding, notable, profound) | |
| intrinsic(adjective, important, original, serious) | |
| manifest(adjective, clear, unusual, important, famous) | |
| massive(big, heavy, large, considerable) | |
| mattering much(expression, big, valuable, vital) | |
| mondo(big, important, large) |
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| APA | Smart Define. (2016). significant thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/significant/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, significant thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>. |
| MLA | Smart Define. "significant thesaurus" 4 March 2016. Web. 25 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms> |