54 entries under spontaneous topic. ×

26
natural(adjective, characteristic, open, simple, plain)
23
involuntary(noun, adjective, simple, reasonable, cold)
21
impulsive(noun, adjective, open, simple, easy)
20
intuitive(adjective, characteristic, reasonable, physical, common)
18
innate(adjective, characteristic, reasonable, physical, common)
18
instinctual(adjective, feeling, physical, natural, impulse)
15
automatic(adjective, simple, passionate, violent, cold)
14
unconscious(adjective, simple, careless, cold, natural)
13
visceral(adjective, physical, natural, emotional, perceptive)
11
immediate(noun, adjective, automatic)
10
unpremeditated(noun, adjective, rude, passionate, violent)
9
inborn(adjective, characteristic, reasonable, physical, common)
7
unintentional(adjective, simple, natural, casual, impulsive)
6
habitual(adjective, reasonable, cold, common, ordinary)
4
unprompted(adjective, simple, passionate, violent, natural)
4
extemporaneous(noun, adjective, simple, passionate, violent)
3
impetuous(noun, adjective, simple, passionate, violent)
3
impromptu(adjective, simple, natural, casual, impulsive)
3
unforced(adjective, open, simple, easy, natural)
3
unplanned(noun, adjective, simple, natural, casual)
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APASmart Define. (2015). instinctive thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/instinctive/thesaurus/synonyms
ChicagoSmart Define. 2015. "instinctive thesaurus" https://smartdefine.org/instinctive/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, instinctive thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/instinctive/thesaurus/synonyms>.
MLASmart Define. "instinctive thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/instinctive/thesaurus/synonyms>