- Definitions|2
- Thesaurus|5k
- Abbreviations|0
89 entries under important topic. ×
| serious(adjective, importance, big, heavy) | |
| momentous(adjective, strong, importance, big, heavy) | |
| generous(adjective, good, give, great, fair) | |
| meaningful(adjective, strong, importance, big, heavy) | |
| key(adjective, importance, valuable, main) | |
| massive(adjective, hard, great, big, heavy) | |
| goodly(adjective, great, reasonable, big) | |
| hefty(adjective, strong, hard, great, tough) | |
| sizable(adjective, great, reasonable, fair, big) | |
| vital(adjective, importance, valuable, main) | |
| powerful(adjective, good, strong, sound, tough) | |
| tidy(adjective, great, reasonable, big) | |
| bulky(adjective, great, big, heavy) | |
| huge(adjective, great, big, heavy) | |
| valuable(adjective, great, big, significant) | |
| heavy(adjective, give, strong, hard, great) | |
| historic(adjective, importance, main, extremely significant) | |
| vast(adjective, great, big, significant) | |
| well-built(adjective, calm, strong, sound, secure) | |
| plentiful(adjective, give, great, big) |
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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> |