78 entries under significant topic. ×
| central(adjective, important, essential, vital) | |
| exigent(adjective, hard, tough, difficult, big) | |
| tough(adjective, hard, difficult, harsh, important) | |
| heavy(adjective, great, harsh, extraordinary, big) | |
| notable(adjective, great, heavy, important, lively) | |
| portentous(adjective, bad, big, heavy) | |
| ugly(adjective, mean, bad, nasty, cross) | |
| fateful(adjective, important, lively, key) | |
| conclusive(adjective, important, determined, definite) | |
| primary(adjective, big, important, substantial) | |
| meaningful(adjective, great, important, substantial) | |
| considerable(adjective, big, heavy, important) | |
| definitive(adjective, last, definite, key) | |
| determining(big, important, substantial, serious) | |
| grievous(adjective, hard, great, tough, difficult) | |
| historic(adjective, great, extraordinary, important, lively) | |
| influential(adjective, great, important, serious) | |
| material(adjective, big, heavy, important) | |
| ominous(adjective, heavy, negative, hostile) | |
| outstanding(adjective, great, important, lively) |
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| APA | Smart Define. (2016). critical thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/critical/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "critical thesaurus" https://smartdefine.org/critical/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, critical thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/critical/thesaurus/synonyms>. |
| MLA | Smart Define. "critical thesaurus" 16 February 2016. Web. 25 September 2026. <https://smartdefine.org/critical/thesaurus/synonyms> |