64 entries under spontaneous topic. ×

12
natural(adjective, open, simple, reasonable, clean)
12
simple(adjective, clean, honest, plain, natural)
11
uncontrived(adjective, open, simple, easy, natural)
11
unsophisticated(adjective, simple, clean, honest, plain)
10
unpremeditated(adjective, free, casual, impromptu)
9
extempore(adjective, free, simple, fake, natural)
9
impromptu(adjective, adverb, free, simple, fake)
9
informal(adjective, free, casual, impulsive)
9
offhand(adjective, free, simple, fake, natural)
8
extemporaneous(adjective, simple, natural, casual, impulsive)
8
instinctive(adjective, open, simple, easy, natural)
8
modest(adjective, honest, ordinary, natural, straightforward)
8
unassuming(adjective, simple, honest, plain, modest)
8
unplanned(adjective, free, simple, fake, natural)
6
casual(adjective, free, simple, fake, loose)
6
extemporary(adjective, free, casual, impulsive)
6
spur-of-the-moment(adjective, free, impromptu, unrehearsed)
6
unprepared(adjective, free, casual, impromptu)
6
unpretentious(adjective, open, simple, reasonable, easy)
5
automatic(adjective, free, simple, fake, natural)
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APASmart Define. (2015). unstudied thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unstudied/thesaurus/synonyms
ChicagoSmart Define. 2015. "unstudied thesaurus" https://smartdefine.org/unstudied/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unstudied thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unstudied/thesaurus/synonyms>.
MLASmart Define. "unstudied thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unstudied/thesaurus/synonyms>