66 entries under substantial topic. ×
| chief(adjective, great, significant, essential, basic) | |
| signal(adjective, outstanding, characteristic, great, extraordinary) | |
| big(adjective, famous, significant, valuable) | |
| necessary(adjective, significant, essential, critical, basic) | |
| considerable(adjective, significant, large, ample) | |
| primary(adjective, significant, essential, basic) | |
| conspicuous(adjective, great, extraordinary, unusual, famous) | |
| meaningful(adjective, significant, strong, big) | |
| pressing(adjective, vital, weighty, crucial, tough) | |
| decisive(adjective, characteristic, feature, severe, importance) | |
| paramount(adjective, significant, essential, critical, basic) | |
| relevant(adjective, characteristic, appropriate, useful) | |
| salient(adjective, significant, essential, main, characteristic) | |
| imperative(adjective, serious, essential, critical, vital) | |
| heavy(adjective, deep, essential, critical, weighty) | |
| esteemed(adjective, characteristic, useful, beneficial, feature) | |
| exceptional(adjective, great, bad, excellent, extraordinary) | |
| big-league(adjective, valuable, importance, main, notable) | |
| earnest(adjective, valuable, importance, main) | |
| renowned(adjective, great, big, famous, outstanding) |
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| APA | Smart Define. (2016). important thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/important/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "important thesaurus" https://smartdefine.org/important/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, important thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/important/thesaurus/synonyms>. |
| MLA | Smart Define. "important thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/important/thesaurus/synonyms> |