| unnecessary(adjective, unimportant, trivial, valuable, required) | |
| voluntary(adjective, unimportant, trivial) | |
| inessential(noun, adjective, unimportant, trivial) | |
| ancillary(adjective, extra, supplementary) | |
| needless(adjective, reasonable, unimportant, trivial) | |
| unimportant(adjective, important, substantial, trivial) | |
| nonessential(adjective, important, unimportant, trivial, essential) | |
| superfluous(adjective, reasonable) | |
| surplus(adjective, extra, wanting) | |
| useless(adjective, unimportant, trivial) | |
| extra(adjective, common, usual, unimportant, trivial) | |
| dispensable(adjective, able, necessary) | |
| spare(adjective, reserve, extra, thick) | |
| contingent(adjective, unimportant, trivial) | |
| optional | |
| gratuitous | |
| avoidable | |
| discretionary | |
| doubtful | |
| elective |
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| APA | Smart Define. (2015). necessary thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/necessary/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, necessary thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/necessary/thesaurus/antonyms>. |
| MLA | Smart Define. "necessary thesaurus" 2 November 2015. Web. 21 September 2026. <https://smartdefine.org/necessary/thesaurus/antonyms> |