88 entries under straightforward topic. ×

39
natural(adjective, calm, open, simple, plain)
12
free(adjective, feature, characteristic, simple, fake)
11
unconstrained(adjective, feature, characteristic, free, simple)
10
extempore(adjective, free, simple, fake, informal)
5
intimate(adjective, simple, plain, casual)
5
simple(adjective, open, light, easy, pure)
5
snap(noun, adjective, light, free, simple)
4
direct(adjective, honest, natural, candid)
3
open(adjective, calm, simple, easy, informal)
3
frank(adjective, open, simple, easy, careless)
3
genuine(adjective, feature, characteristic, honest, modest)
3
off-the-cuff(adjective, simple, informal, natural)
3
unrestrained(adjective, calm, simple, plain, relaxed)
2
effortless(adjective, calm, quiet, light, smooth)
2
forthright(adjective, calm, quiet, open, light)
2
honest(adjective, weak, careless, natural)
2
improv(adjective, free, simple, fake, informal)
2
loose(adjective, simple, easy, plain, careless)
2
ordinary(adjective, simple, reasonable, common, usual)
2
relaxed(adjective, calm, quiet, light, smooth)
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APASmart Define. (2015). spontaneous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/spontaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "spontaneous thesaurus" https://smartdefine.org/spontaneous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, spontaneous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/spontaneous/thesaurus/synonyms>.
MLASmart Define. "spontaneous thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/spontaneous/thesaurus/synonyms>