30 entries under adjective topic. ×
| optional(possible, forced) | |
| voluntary | |
| elective | |
| discretionary | |
| free | |
| volitional | |
| willful | |
| deliberate | |
| dispensable | |
| liberalized | |
| unstipulated | |
| willing | |
| peaceful | |
| unforced | |
| agreeable | |
| arbitral | |
| arbitrary | |
| discreet | |
| eligible | |
| facultative |
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| APA | Smart Define. (2015). compulsory thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/compulsory/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "compulsory thesaurus" https://smartdefine.org/compulsory/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, compulsory thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/compulsory/thesaurus/antonyms>. |
| MLA | Smart Define. "compulsory thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/compulsory/thesaurus/antonyms> |