89 entries under natural topic. ×

20
spontaneous(adjective, plain, thoughtless, impulsive)
16
impulsive(adjective, simple, casual, thoughtless)
12
involuntary(adjective, simple, casual, thoughtless)
8
unthinking(adjective, instinctive, unwilling, automatic)
8
voluntary(adjective, simple, casual, impulsive)
6
accustomed(adjective, instinctive, automatic, inherent)
6
congenital(adjective, instinctive, automatic, inherent)
6
extemporaneous(adjective, simple, plain, violent)
6
habitual(adjective, instinctive, unwilling, automatic)
6
impromptu(adjective, adverb, simple, plain)
6
inborn(adjective, instinctive, automatic, inherent)
6
ingrained(adjective, instinctive, automatic, inherent)
6
inherent(adjective, instinctive, automatic, innate)
6
innate(adjective, instinctive, automatic, inherent)
6
instinctive(adjective, simple, passionate, violent)
6
intrinsic(adjective, instinctive, automatic, inherent)
6
intuitional(adjective, instinctive, automatic, inherent)
6
knee-jerk(adjective, instinctive, unwilling, automatic)
6
mechanical(adjective, instinctive, automatic, inherent)
6
native(adjective, instinctive, automatic, inherent)
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APASmart Define. (2015). unprompted thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/unprompted/thesaurus/synonyms
ChicagoSmart Define. 2015. "unprompted thesaurus" https://smartdefine.org/unprompted/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2015, unprompted thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/unprompted/thesaurus/synonyms>.
MLASmart Define. "unprompted thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/unprompted/thesaurus/synonyms>