66 entries under substantial topic. ×
| significant(adjective, main, importance, valuable) | |
| crucial(adjective, characteristic, great, severe, significant) | |
| momentous(adjective, significant, valuable, importance) | |
| essential(adjective, valuable, main, importance) | |
| critical(adjective, characteristic, great, significant, serious) | |
| vital(adjective, essential, importance, characteristic, significant) | |
| major(adjective, great, exceptional, significant, essential) | |
| consequential(adjective, significant, importance, big) | |
| noteworthy(adjective, outstanding, worthy, characteristic, great) | |
| influential(adjective, powerful, notable, importance) | |
| serious(adjective, crucial, great, importance) | |
| weighty(adjective, significant, strong, importance) | |
| grave(adjective, crucial, severe, importance) | |
| distinguished(adjective, outstanding, great, excellent, famous) | |
| principal(adjective, significant, essential, basic, vital) | |
| substantial(adjective, significant, importance, powerful, characteristic) | |
| foremost(adjective, characteristic, significant, essential, main) | |
| material(adjective, significant, importance, characteristic) | |
| great(adjective, excellent, exceptional, valuable, characteristic) | |
| urgent(adjective, characteristic, serious, critical, vital) |
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| APA | Smart Define. (2016). important thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/important/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "important thesaurus" https://smartdefine.org/important/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, important thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/important/thesaurus/synonyms>. |
| MLA | Smart Define. "important thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/important/thesaurus/synonyms> |