142 entries under substantial topic. ×
| ample(adjective, large, considerable) | |
| heavy(adjective, great, tough, severe, big) | |
| pointed(adjective, clear, open, severe, sharp) | |
| pronounced(adjective, clear, energetic, definite) | |
| valuable(adjective, good, big, important) | |
| bountiful(adjective, large) | |
| evident(adjective, clear, big, unusual, important) | |
| much(adverb, large) | |
| palpable(adjective, considerable) | |
| sensible(adjective, good, big, definite) | |
| solid(adjective, extraordinary, proper, exceptional) | |
| detectable | |
| discernible(adjective, definite, considerable) | |
| distinguishable(adjective, considerable) | |
| extensive(adjective, big, large, valuable) | |
| firm(adjective, large, key, considerable) | |
| healthy(adjective, big, important, definite) | |
| obvious(adjective, clear, definite, evident) | |
| real | |
| sizable(adjective, definite, large, considerable) |
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| APA | Smart Define. (2016). significant thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/significant/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, significant thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>. |
| MLA | Smart Define. "significant thesaurus" 4 March 2016. Web. 23 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms> |