142 entries under substantial topic. ×
| appreciable(adjective, large, considerable, noticed) | |
| chief(adjective, superior, big, unusual, important) | |
| essential(adjective, importance, big, important, original) | |
| conspicuous(adjective, clear, solid, extraordinary, big) | |
| decisive(adjective, great, extraordinary, big, important) | |
| noticeable(adjective, clear, solid, extraordinary, unusual) | |
| principal(adjective, good, great, big, important) | |
| large(adjective, strong, big, important) | |
| pressing(verb, adjective, tough, severe, big) | |
| rich(adjective, strong, sound, intense, comfort) | |
| substantive | |
| distinguished(adjective, extraordinary, superior, big, unusual) | |
| exceptional(adjective, solid, extraordinary, superior, big) | |
| marked(adjective, clear, solid, extraordinary, superior) | |
| necessary(adjective, big, important, original) | |
| primary(adjective, superior, big, unusual, important) | |
| respectable(adjective, large, admired, respected) | |
| salient(adjective, extraordinary, unusual, important) | |
| tidy(adjective, large, considerable) | |
| urgent(adjective, clear, tough, severe, big) |
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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> |