82 entries under free topic. ×

25
automatic(adjective, fake, natural, casual)
19
unpremeditated(noun, adjective, impulsive, planned)
17
unplanned(noun, adjective, fake, informal)
15
impromptu(adjective, adverb, plain, impulsive)
15
voluntary(adjective, feature, characteristic, deliberate)
11
offhand(noun, adjective, careless, casual)
11
gratuitous(adjective, feature, characteristic, deliberate)
11
immediate(noun, adjective, instinctive, sudden)
11
unconstrained(adjective, feature, characteristic, simple)
10
unrehearsed(adjective, plain, impulsive, unprepared)
10
extempore(adjective, simple, fake, informal)
10
spur-of-the-moment(noun, adjective, fake, informal)
10
unasked(adjective, feature, characteristic, regard)
10
unstudied(adjective, simple, easy, impulsive)
9
informal(adjective, simple, plain, relaxed)
9
improvised(adjective, impulsive, willing, impulse)
9
unbidden(adjective, deliberate, natural, impulsive)
9
casual(adjective, calm, fake, plain)
9
unprepared(adjective, ready, impromptu, unplanned)
8
intended(verb, adjective, feature, characteristic)
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APASmart Define. (2015). spontaneous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/spontaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "spontaneous thesaurus" https://smartdefine.org/spontaneous/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, spontaneous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/spontaneous/thesaurus/synonyms>.
MLASmart Define. "spontaneous thesaurus" 3 August 2015. Web. 27 September 2026. <https://smartdefine.org/spontaneous/thesaurus/synonyms>