- Definitions|0
- Thesaurus|77
- Abbreviations|2
19 entries under voluntary topic. ×
| optional(adjective, useless, worthless, unwarranted, possible) | |
| facultative(adjective, open, free, elective) | |
| noncompulsory(open, free, worthless, pointless, irrelevant) | |
| alternative(open, free, elective) | |
| arbitrary(open, free, elective) | |
| discretionary(open, free, elective) | |
| elective(open, free) | |
| extra(open, free, elective) | |
| free(open, elective) | |
| no strings attached(expression, idiom, open, free) | |
| nonobligatory(open, free, elective) | |
| open(free, elective) | |
| possible | |
| uncompelled | |
| unforced(open, free, elective) | |
| unrestricted(open, free, elective) | |
| up to the individual(expression, idiom, open, free) | |
| volitional(open, free, elective) | |
| discretional(open, free, elective) |
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| APA | Smart Define. (2015). not required thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/not_required/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "not required thesaurus" https://smartdefine.org/not_required/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, not required thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/not_required/thesaurus/synonyms>. |
| MLA | Smart Define. "not required thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/not_required/thesaurus/synonyms> |