147 entries under significant topic. ×
| prerequisite(noun, adjective, form, fix, pass) | |
| material(noun, adjective, drop, body, physical) | |
| central(adjective, important, original, basic) | |
| cardinal(adjective, importance, important, original) | |
| substantial(adjective, physical, importance, material, big) | |
| integral(adjective, characteristic, body, importance, material) | |
| critical(adjective, severe, big, important) | |
| underlying(adjective, simple, plain, important) | |
| leading(adjective, feature, state, characteristic, importance) | |
| needed(adjective, set, important, capital) | |
| radical(adjective, importance, important, original) | |
| focal(adjective, important, main, private) | |
| grave(adjective, severe, importance, big, important) | |
| mandatory(adjective, set, basic, vital) | |
| meaningful(adjective, importance, big, important) | |
| needful(adjective, set, important, original) | |
| obligatory(adjective, important, critical, basic) | |
| serious(adjective, severe, importance, big, important) | |
| weighty(adjective, importance, big, important) | |
| consequential(adjective, importance, big, important) |
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| APA | Smart Define. (2016). essential thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/essential/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "essential thesaurus" https://smartdefine.org/essential/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, essential thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/essential/thesaurus/synonyms>. |
| MLA | Smart Define. "essential thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/essential/thesaurus/synonyms> |