26 entries under adjective topic. ×
| optional | |
| voluntary | |
| unnecessary | |
| unforced | |
| discretionary | |
| not needed(expression, state, need, obligation) | |
| not obligatory(expression, idiom, state, need) | |
| elective | |
| tolerable | |
| adventitious | |
| arbitrary | |
| volitional | |
| willing | |
| accidental | |
| admissible | |
| agreeable | |
| arbitral | |
| capable | |
| discretional | |
| facultative |
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| APA | Smart Define. (2015). mandatory thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/mandatory/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "mandatory thesaurus" https://smartdefine.org/mandatory/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, mandatory thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/mandatory/thesaurus/antonyms>. |
| MLA | Smart Define. "mandatory thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/mandatory/thesaurus/antonyms> |