118 entries under significant topic. ×
| super(adjective, good, great, unusual, important) | |
| terrific(adjective, great, unusual, important, exceptional) | |
| tidy(large, controlled, considerable, orderly) | |
| valuable(adjective, good, big, important) | |
| worthwhile(adjective, strong, solid, big, important) | |
| abundant(large, considerable) | |
| ample(large, considerable) | |
| big-deal(large, considerable) | |
| bulky(big, heavy, substantial, large) | |
| durable(large, considerable) | |
| mattering much(expression, big, substantial, valuable) | |
| plentiful(large, considerable) | |
| sizable(large, considerable) | |
| stout(big, heavy, substantial, large) | |
| superabundant(large, considerable) | |
| superior(adjective, important, critical, prominent) | |
| vast(large, considerable) | |
| well-built(large, considerable) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |