97 entries under significant topic. ×
| large(adjective, great, big, substantial) | |
| ample(adjective, open, great, complete, top) | |
| great(adjective, strong, intense, big, powerful) | |
| big(adjective, great, big, substantial) | |
| far-reaching(adjective, open, great, complete, spread) | |
| considerable(adjective, great, big, substantial) | |
| substantial(adjective, great, big, large) | |
| important(adjective, substantial, large, valuable) | |
| sizeable(adjective, substantial, large) | |
| serious(big, substantial, large, valuable) | |
| tidy(adjective, great, informal, big) | |
| weighty(big, substantial, large, valuable) | |
| astronomical(common, substantial, large, huge) | |
| goodly(great, big, substantial, large) | |
| big-league(vital, imperative) | |
| bountiful(adjective, great, heavy, substantial) | |
| comfortable(open, substantial, large, generous) | |
| conspicuous(vital, imperative) | |
| decisive(big, substantial, valuable, vital) | |
| determining(big, substantial, valuable, vital) |
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| APA | Smart Define. (2016). extensive thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/extensive/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "extensive thesaurus" https://smartdefine.org/extensive/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, extensive thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/extensive/thesaurus/synonyms>. |
| MLA | Smart Define. "extensive thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/extensive/thesaurus/synonyms> |