48 entries under voluntary topic. ×
| elective(adjective, choice, able, possible) | |
| free(adjective, deliberate, natural, willing, will) | |
| discretional(adjective, free, deliberate, natural, choice) | |
| unforced(adjective, free, deliberate, natural, willing) | |
| alternative(adjective, irregular, extra, different, possible) | |
| arbitrary(adjective, chance, possible, uninformed, random) | |
| volitional(adjective, free, deliberate, natural, willing) | |
| facultative(adjective, choice, possible, elective) | |
| nonobligatory(adjective, possible, elective) | |
| open(adjective, possible, elective) | |
| spontaneous(adjective, free, deliberate, natural, willing) | |
| volunteer(adjective, free, deliberate, natural, willing) | |
| willful(adjective, free, deliberate, natural, unreasonable) | |
| extra(adjective, spare, excess, further, surplus) | |
| uncompelled(adjective, free, deliberate, natural, willing) | |
| unrestricted(adjective, possible, elective) | |
| autonomous(adjective, free, deliberate, natural, willing) | |
| deliberate(adjective, free, natural, willing, charitable) | |
| gratuitous(adjective, free, deliberate, natural, casual) | |
| independent(adjective, 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> |