78 entries under basic topic. ×
| underlined(important, essential, critical, fundamental) | |
| urgent(important, significant, essential, critical) | |
| bottom line(expression, important, significant, essential) | |
| cold(adjective, absolute, fundamental, central) | |
| complete(adjective, absolute, fundamental, central) | |
| congenital(adjective, essential, absolute, fundamental) | |
| connate(adjective, essential, absolute, fundamental) | |
| deep(original, primary) | |
| ideal(noun, adjective, inspiration, absolute) | |
| in demand(expression, main, chief, necessary) | |
| inborn(adjective, essential, absolute, fundamental) | |
| inbred(adjective, essential, absolute, fundamental) | |
| innate(adjective, essential, absolute, fundamental) | |
| meat and potatoes(expression, adjective, idiom, important, significant) | |
| name of the game(expression, adjective, idiom, important, essential) | |
| natural(noun, adjective, edge, essential, tone) | |
| particular(essential, chief, foremost, inherent) | |
| perfect(adjective, absolute, fundamental, central) |
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| APA | Smart Define. (2016). key thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/key/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "key thesaurus" https://smartdefine.org/key/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, key thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/key/thesaurus/synonyms>. |
| MLA | Smart Define. "key thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/key/thesaurus/synonyms> |