Premeditated Thesaurus / Antonyms

6	spontaneous(adjective, impulsive, willing, planned)
5	unpremeditated(adjective, planned)
3	unplanned(adjective, deliberate, spontaneous)
3	accidental(adjective, deliberate, spontaneous, unexpectedly)
3	casual(adjective, chance, spontaneous, random)
3	extemporaneous(adjective, improvised, rehearsed)
3	impulsive
2	inadvertent
2	involuntary
2	unintentional(adjective, spontaneous)
2	unwitting
1	automatic
1	chance
1	fortuitous
1	impromptu(adjective, adverb, unrehearsed, improvised)
1	incidental
1	offhand
1	unintended
0	abrupt
0	ad-lib

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APA	Smart Define. (2015). premeditated thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/premeditated/thesaurus/antonyms
Chicago	Smart Define. 2015. "premeditated thesaurus" https://smartdefine.org/premeditated/thesaurus/antonyms (accessed September 24, 2026).
Harvard	Smart Define 2015, premeditated thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/premeditated/thesaurus/antonyms>.
MLA	Smart Define. "premeditated thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/premeditated/thesaurus/antonyms>

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