86 entries under willing topic. ×

9
unbidden(adjective, free, deliberate, natural, impulsive)
9
unconscious(adjective, careless, casual, impulsive)
9
casual(adjective, calm, free, fake, plain)
8
ad-lib(adjective, impulsive, unprepared, impromptu)
8
intended(verb, adjective, feature, characteristic, free)
7
uncompelled(adjective, free, deliberate, natural, impulsive)
6
intentional(adjective, feature, characteristic, free, regard)
6
unintentional(adjective, natural, chance, routine, impulsive)
6
volitional(adjective, feature, characteristic, free, regard)
6
volunteer(adjective, feature, characteristic, free, regard)
5
chosen(verb, adjective, feature, characteristic, free)
5
discretional(adjective, feature, characteristic, free, deliberate)
5
independent(adjective, feature, characteristic, free, deliberate)
5
simple(adjective, open, light, easy, pure)
5
unsophisticated(adjective, simple, easy, pure, impulsive)
5
willed(adjective, feature, characteristic, free, regard)
5
willful(adjective, free, deliberate, natural)
4
autonomous(adjective, feature, characteristic, free, deliberate)
4
optional(adjective, free, deliberate, natural)
4
uncontrolled(adjective, reasonable, relaxed, wild, common)
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APASmart Define. (2015). spontaneous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/spontaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "spontaneous thesaurus" https://smartdefine.org/spontaneous/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, spontaneous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/spontaneous/thesaurus/synonyms>.
MLASmart Define. "spontaneous thesaurus" 3 August 2015. Web. 29 September 2026. <https://smartdefine.org/spontaneous/thesaurus/synonyms>