142 entries under substantial topic. ×
| observable(adjective, great, extraordinary, unusual, important) | |
| of moment(expression, big, important, valuable) | |
| of note(expression, big, valuable, vital) | |
| of substance(expression, big, valuable, vital) | |
| physical | |
| pointful(important, serious, consistent, related) | |
| ponderous(big, heavy, valuable, vital) | |
| severe(adjective, tough, sharp, big, heavy) | |
| solid gold(expression, big, important, large) | |
| something(big, important, large, valuable) | |
| something else(expression, adjective, big, unusual, important) | |
| standout(big, outstanding, valuable, vital) | |
| super-duper(big, important, large) | |
| to the max(expression, idiom, big, important) | |
| underlined(adjective, big, unusual, heavy, important) | |
| united | |
| unreal(adjective, superior, big, unusual, important) | |
| venerable(big, important, large) | |
| ascertainable(definite, considerable) | |
| astronomical |
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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> |