164 entries under substantial topic. ×
| determining(significant, valuable, vital, imperative) | |
| doozie(important, significant, large) | |
| dynamite(important, significant, large) | |
| enduring(adjective, strong, sound, tough, solid) | |
| energetic(adjective, strong, sound, tough, solid) | |
| exigent(significant, valuable, vital, imperative) | |
| far-reaching(important, significant, large, grand) | |
| fixed(adjective, strong, sound, tough, solid) | |
| forceful(adjective, strong, sound, tough, solid) | |
| forcible(adjective, strong, sound, tough, solid) | |
| front-page(significant, valuable, vital, imperative) | |
| hale(adjective, strong, sound, tough, solid) | |
| hard as nails(expression, adjective, idiom, strong, sound) | |
| imperative(significant, valuable, vital) | |
| importunate(significant, valuable, vital, imperative) | |
| in fine feather(expression, adjective, idiom, strong, sound) | |
| marked(significant, large, valuable, vital) | |
| mattering much(expression, significant, valuable, vital) | |
| mondo(adjective, great, important, significant) | |
| necessary(adjective, great, significant, large) |
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| APA | Smart Define. (2016). big thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/big/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "big thesaurus" https://smartdefine.org/big/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, big thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/big/thesaurus/synonyms>. |
| MLA | Smart Define. "big thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/big/thesaurus/synonyms> |