- Definitions|2
- Thesaurus|5k
- Abbreviations|0
140 entries under significant topic. ×
| serious(adjective, importance, big, heavy, important) | |
| sizeable(adjective, large) | |
| momentous(adjective, strong, importance, big, heavy) | |
| generous(adjective, good, give, great, fair) | |
| meaningful(adjective, strong, importance, big, heavy) | |
| goodly(adjective, great, reasonable, big, important) | |
| hefty(adjective, strong, hard, great, tough) | |
| sizable(adjective, great, reasonable, fair, big) | |
| powerful(adjective, good, strong, sound, tough) | |
| comfortable(adjective, calm, quiet, light, smooth) | |
| huge(adjective, great, big, heavy, important) | |
| valuable(adjective, great, big, important) | |
| appreciable(adjective, reasonable, large, adequate) | |
| heavy(adjective, give, strong, hard, great) | |
| palpable(adjective, physical, material, considerable) | |
| sensible(adjective, good, body, reasonable, firm) | |
| vast(adjective, great, big, important) | |
| well-built(adjective, calm, strong, sound, secure) | |
| earnest(adjective, importance, big, heavy, enthusiastic) | |
| plentiful(adjective, give, great, big, important) |
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| APA | Smart Define. (2016). substantial thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/substantial/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "substantial thesaurus" https://smartdefine.org/substantial/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, substantial thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/substantial/thesaurus/synonyms>. |
| MLA | Smart Define. "substantial thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/substantial/thesaurus/synonyms> |