106 entries under essential topic. ×
| substratal(adjective, important, original, basic) | |
| substrative(adjective, important, original, basic) | |
| superlative(adjective, important, extreme, critical) | |
| supporting(adjective, important, original, basic) | |
| supreme(adjective, extreme, best, main) | |
| surpassing(adjective, great, extraordinary, important, extreme) | |
| sustaining(adjective, important, original, basic) | |
| theoretical(adjective, important, original, basic) | |
| topmost(adjective, extreme, best, main) | |
| ultimate(adjective, extreme, best, fundamental) | |
| underived(adjective, important, original, basic) | |
| underlined(adjective, big, unusual, heavy, important) | |
| underlying(adjective, important, original, basic) | |
| unsurpassable(adjective, extreme, superlative, supreme) | |
| best(adjective, superior, unusual, exceptional) | |
| binding(adjective, basic, vital, effective) | |
| bottom line(expression, important, basic, vital) | |
| categorical(adjective, energetic, vigorous, definite, sober) | |
| coal and ice(expression, idiom, important, critical) | |
| compulsory(adjective, basic, vital, required) |
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| APA | Smart Define. (2016). significant thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/significant/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "significant thesaurus" https://smartdefine.org/significant/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, significant thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/significant/thesaurus/synonyms>. |
| MLA | Smart Define. "significant thesaurus" 4 March 2016. Web. 24 September 2026. <https://smartdefine.org/significant/thesaurus/synonyms> |