81 entries under casual topic. ×

21
spontaneous(noun, adjective, free, fake, informal)
20
unpremeditated(noun, adjective, free, chance)
19
accidental(adjective, careless, chance, planned)
17
unintentional(adjective, simple, natural, chance)
15
chance(adjective, careless, planned, erratic)
14
fortuitous(adjective, chance, planned, erratic)
14
random(adjective, insignificant, chance, irregular)
13
impromptu(adjective, free, simple, fake, informal)
12
haphazard(adjective, insignificant, chance, irregular)
12
unwitting(adjective, careless, planned, reckless)
11
unprepared(adjective, free, ready, unqualified)
10
extemporaneous(noun, adjective, simple, informal, natural)
10
offhand(noun, adjective, free, simple, fake)
8
incidental(adjective, chance, random, haphazard)
8
unstudied(adjective, free, simple, fake, natural)
7
extempore(adjective, free, simple, fake, informal)
7
impetuous(noun, adjective, simple, natural)
7
impulsive(noun, adjective, simple, violent, natural)
7
involuntary(noun, adjective, simple, natural)
6
snap(noun, adjective, free, informal)
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APASmart Define. (2015). unplanned thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unplanned/thesaurus/synonyms
ChicagoSmart Define. 2015. "unplanned thesaurus" https://smartdefine.org/unplanned/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, unplanned thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unplanned/thesaurus/synonyms>.
MLASmart Define. "unplanned thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/unplanned/thesaurus/synonyms>