48 entries under voluntary topic. ×
| intended(adjective, free, deliberate, natural, willing) | |
| intentional(adjective, free, deliberate, natural, willing) | |
| noncompulsory(adjective, extra, worthless, possible, pointless) | |
| unasked(adjective, free, deliberate, natural, willing) | |
| unbidden(adjective, free, deliberate, natural, willing) | |
| unprompted(natural, spontaneous) | |
| willed(adjective, free, deliberate, natural, willing) | |
| chosen(adjective, free, deliberate, natural, willing) | |
| designful(adjective, free, deliberate, natural, willing) | |
| elected(adjective, free, deliberate, natural, willing) | |
| free-willed(adjective, free, deliberate, natural, willing) | |
| freely(adjective, free, deliberate, natural, willing) | |
| honorary(adjective, free, deliberate, natural, willing) | |
| no strings attached(expression, adjective, idiom, possible) | |
| not required(expression, adjective, useless, worthless, unwarranted) | |
| opted(adjective, free, deliberate, natural, willing) | |
| unconstrained(adjective, free, deliberate, natural, willing) | |
| unpaid(adjective, free, deliberate, natural, willing) | |
| unprescribed(adjective, free, deliberate, natural, willing) | |
| up to the individual(expression, adjective, idiom, possible) |
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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> |