3
natural(adjective, simple, casual, impulsive, willing)
3
nominal(adjective, feature, characteristic)
3
purposed(verb, adjective, deliberate, careful, thoughtful)
3
self-imposed
3
unrecompensed(adjective, work, pay, unpaid, unrewarded)
3
unremunerated(adjective, work, pay, unpaid, unrewarded)
3
voluntarily(adjective, adverb, willing, arrogant, unsolicited)
2
alternative(open, free, elective)
2
amateur(adjective, honorary)
2
arbitrary(open, free, elective)
2
automatic(adjective, simple, natural, casual, impulsive)
2
contemplated(deliberate, determined, intentional, treated, thought-out)
2
express(adjective, exact, certain, deliberate, careful)
2
extemporaneous(adjective, simple, natural, casual, impulsive)
2
free will(expression, idiom)
2
impulsive(adjective, simple, natural, casual, willing)
2
leap
2
meant(deliberate, planned, intended)
2
meditated(deliberate, planned, intended)
2
nonobligatory(open, free, elective)
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APASmart Define. (2015). voluntary thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/voluntary/thesaurus/synonyms
ChicagoSmart Define. 2015. "voluntary thesaurus" https://smartdefine.org/voluntary/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, voluntary thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/voluntary/thesaurus/synonyms>.
MLASmart Define. "voluntary thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/voluntary/thesaurus/synonyms>