70 entries under adjective topic. ×

19
voluntary(noun, feature, characteristic, work)
11
unpaid(feature, characteristic, free, deliberate)
9
unforced(feature, characteristic, free, regard)
8
spontaneous(feature, characteristic, free, regard)
6
unasked(feature, characteristic, free, regard)
5
free(feature, characteristic, deliberate, natural)
5
intended(feature, characteristic, free, regard)
5
intentional(feature, characteristic, free, regard)
5
uncompensated(feature, characteristic, regard, unpaid)
5
unconstrained(feature, characteristic, free, regard)
5
volitional(feature, characteristic, free, regard)
5
willed(feature, characteristic, free, regard)
4
autonomous(feature, characteristic, free, deliberate)
4
discretional(feature, characteristic, free, deliberate)
4
gratuitous(feature, characteristic, free, deliberate)
4
independent(feature, characteristic, free, deliberate)
4
optional(free, deliberate, natural, willing)
4
unbidden(free, deliberate, natural, willing)
4
unsalaried(feature, characteristic, voluntary, unpaid)
3
chosen(feature, characteristic, free, deliberate)
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APASmart Define. (2015). volunteer thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/volunteer/thesaurus/synonyms
ChicagoSmart Define. 2015. "volunteer thesaurus" https://smartdefine.org/volunteer/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, volunteer thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/volunteer/thesaurus/synonyms>.
MLASmart Define. "volunteer thesaurus" 20 July 2015. Web. 27 September 2026. <https://smartdefine.org/volunteer/thesaurus/synonyms>