| auxiliary(adjective, insignificant, unimportant) | |
| collateral | |
| conundrum | |
| dependent(adjective, lead, importance, head, master) | |
| dispensable | |
| expendable | |
| extra(adjective, insignificant, unimportant) | |
| frivolous | |
| incidental | |
| inessential(adjective, insignificant, unimportant) | |
| inferior | |
| last in line | |
| latch(noun, lock) | |
| lesser(adjective, insignificant, unimportant) | |
| little | |
| negligible | |
| nonessential(adjective, insignificant, unimportant) | |
| nugatory | |
| slight | |
| small |
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| APA | Smart Define. (2016). key thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/key/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "key thesaurus" https://smartdefine.org/key/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, key thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/key/thesaurus/antonyms>. |
| MLA | Smart Define. "key thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/key/thesaurus/antonyms> |