56 entries under voluntary topic. ×

26
free(adjective, feature, characteristic, charge, allow)
22
uncalled-for(adjective, mean, severe, harsh, cruel)
15
unpaid(adjective, feature, state, characteristic, free)
12
spontaneous(adjective, feature, characteristic, free, deliberate)
12
supererogatory(adjective, spare, extreme, useless, extra)
9
unasked(adjective, feature, characteristic, free, deliberate)
8
honorary(adjective, feature, state, characteristic, free)
6
autonomous(adjective, feature, characteristic, free, deliberate)
6
independent(adjective, feature, characteristic, free, deliberate)
6
unforced(adjective, feature, characteristic, free, deliberate)
6
unsalaried(adjective, feature, characteristic, unpaid)
5
unbidden(adjective, free, deliberate, natural, willing)
5
unrequested(adjective, willing, arrogant, unwelcome)
5
willing(adjective, free, charitable, arrogant, independent)
4
discretional(adjective, feature, characteristic, free, deliberate)
4
genuine(adjective, feature, characteristic, natural, spontaneous)
4
uninvited(adjective, willing, unwarranted, arrogant)
4
unsought(adjective, willing, arrogant, unwelcome)
4
unwelcome(adjective, willing, unwarranted, arrogant)
4
volunteer(adjective, feature, characteristic, free, deliberate)
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APASmart Define. (2015). gratuitous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/gratuitous/thesaurus/synonyms
ChicagoSmart Define. 2015. "gratuitous thesaurus" https://smartdefine.org/gratuitous/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, gratuitous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/gratuitous/thesaurus/synonyms>.
MLASmart Define. "gratuitous thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/gratuitous/thesaurus/synonyms>