28 entries under adjective topic. ×
| optional(possible, voluntary, forced) | |
| needless | |
| extra | |
| unnecessary | |
| elective | |
| voluntary | |
| additional | |
| casual | |
| gratuitous | |
| inessential | |
| absolute | |
| autonomous | |
| available | |
| bountiful | |
| broad | |
| costless | |
| detached | |
| distinct | |
| easy | |
| extraordinary |
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| APA | Smart Define. (2015). required thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/required/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "required thesaurus" https://smartdefine.org/required/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, required thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/required/thesaurus/antonyms>. |
| MLA | Smart Define. "required thesaurus" 3 November 2015. Web. 23 September 2026. <https://smartdefine.org/required/thesaurus/antonyms> |