87 entries under simple topic. ×

17
unplanned(adjective, free, fake, natural)
14
offhand(adjective, calm, cool, free)
13
free(adjective, adverb, easy, fake)
11
unintentional(adjective, natural, chance, impulsive)
10
unceremonious(adjective, plain, informal, relaxed)
8
natural(adjective, adverb, calm, open, smooth)
8
impromptu(adjective, free, fake, natural)
7
everyday(adjective, strong, easy, plain)
7
extemporaneous(adjective, free, natural, chance)
6
extempore(adjective, free, fake, natural)
6
familiar(adjective, calm, clear, open, smooth)
6
folksy(adjective, relaxed, indifferent, familiar)
6
impulsive(adjective, smooth, easy, careless)
6
unconscious(adjective, careless, natural, thoughtless)
6
unconstrained(adjective, clear, open, easy)
6
unstudied(adjective, free, fake, loose)
5
automatic(adjective, free, fake, natural)
4
free-and-easy(adjective, kind, relaxed, familiar)
4
general(soft, slight, detail, trivial)
4
homely(adjective, plain, ordinary, familiar)
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APASmart Define. (2015). casual thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/casual/thesaurus/synonyms
ChicagoSmart Define. 2015. "casual thesaurus" https://smartdefine.org/casual/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, casual thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/casual/thesaurus/synonyms>.
MLASmart Define. "casual thesaurus" 1 December 2015. Web. 23 September 2026. <https://smartdefine.org/casual/thesaurus/synonyms>