119 entries under adjective topic. ×
| voluntary(free, deliberate, natural, choice) | |
| discretionary(open, chance, choice, will) | |
| elective(choice, able, possible, voluntary) | |
| free(deliberate, natural, willing, will) | |
| discretional(free, deliberate, natural, choice) | |
| unforced(free, deliberate, natural, willing) | |
| alternative(irregular, extra, different, possible) | |
| arbitrary(chance, possible, uninformed, random) | |
| volitional(free, deliberate, natural, willing) | |
| facultative(choice, possible, voluntary, elective) | |
| uncalled-for(extra, unwarranted, unnecessary, pointless) | |
| unnecessary(extraordinary, new, spare, fresh) | |
| nonobligatory(possible, voluntary, elective) | |
| open(possible, voluntary, elective) | |
| spontaneous(free, deliberate, natural, willing) | |
| volunteer(free, deliberate, natural, willing) | |
| willful(free, deliberate, natural, unreasonable) | |
| extra(spare, excess, further, surplus) | |
| uncoerced | |
| uncompelled(free, deliberate, natural, willing) |
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| APA | Smart Define. (2015). optional thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/optional/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "optional thesaurus" https://smartdefine.org/optional/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, optional thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/optional/thesaurus/synonyms>. |
| MLA | Smart Define. "optional thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/optional/thesaurus/synonyms> |