39 entries under simple topic. ×

19
casual(adjective, free, fake, natural)
17
unintentional(adjective, natural, chance, casual)
13
impromptu(adjective, free, fake, informal)
10
extemporaneous(noun, adjective, informal, natural)
10
offhand(noun, adjective, free, fake)
8
unstudied(adjective, free, fake, natural)
7
extempore(adjective, free, fake, informal)
7
impetuous(noun, adjective, natural, casual)
7
impulsive(noun, adjective, violent, natural)
7
involuntary(noun, adjective, natural, casual)
6
unconscious(adjective, natural, casual, impulsive)
5
improvised(adjective, free, fake, informal)
4
ad-lib(adjective, free, fake, informal)
4
uncontrived(adjective, natural, casual, impulsive)
4
unprompted(adjective, natural, casual, impulsive)
3
instinctive(noun, adjective, natural, casual)
3
natural(adjective, casual, impulsive, willing)
2
automatic(adjective, free, fake, natural)
2
free(adjective, fake, natural, casual)
2
off-the-cuff(adjective, informal, natural, chance)
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APASmart Define. (2015). unplanned thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unplanned/thesaurus/synonyms
ChicagoSmart Define. 2015. "unplanned thesaurus" https://smartdefine.org/unplanned/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, unplanned thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unplanned/thesaurus/synonyms>.
MLASmart Define. "unplanned thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/unplanned/thesaurus/synonyms>