| cardinal(adjective, important, key) | |
| central(adjective, main, middle, principal) | |
| direct | |
| dominant(adjective, main, primary) | |
| essential(adjective, important, basic, vital, fundamental) | |
| first-rate(adjective, important, useful) | |
| firsthand | |
| head(adjective, important, inferior, unimportant, chief) | |
| leading | |
| senior | |
| source(adjective, important, useful, subalternate, shooter) | |
| special(common, uncertain, ordinary) | |
| arch(inferior, insignificant) | |
| best(poor, inferior) | |
| big(adjective, important, useful) | |
| causative(adjective, important, useful) | |
| component | |
| consequential(adjective, important, useful) | |
| improve | |
| integral(adjective, basic, necessary) |
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| APA | Smart Define. (2015). secondary thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/secondary/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "secondary thesaurus" https://smartdefine.org/secondary/thesaurus/antonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, secondary thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/secondary/thesaurus/antonyms>. |
| MLA | Smart Define. "secondary thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/secondary/thesaurus/antonyms> |