17
accidental
15
unintentional(adjective, planned, intentional)
6
inadvertent(adjective, accidental)
5
unstudied
4
abrupt(adjective, suddenly, unexpectedly)
4
casual(adjective, chance, random)
4
impromptu(adjective, adverb, unrehearsed, improvised)
4
random
4
happy
4
hurried
3
spontaneous(adjective, impulsive, willing, planned)
3
extemporaneous(adjective, improvised, rehearsed)
3
eye-opening
3
impulsive(adjective, cautious)
3
instinctive(adjective, conscious, automatic, reflex)
3
involuntary(adjective, intentional)
3
mad
3
unwitting
2
automatic
2
chance(noun, adjective)
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APASmart Define. (2016). deliberate thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/deliberate/thesaurus/antonyms
ChicagoSmart Define. 2016. "deliberate thesaurus" https://smartdefine.org/deliberate/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, deliberate thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/deliberate/thesaurus/antonyms>.
MLASmart Define. "deliberate thesaurus" 1 April 2016. Web. 23 September 2026. <https://smartdefine.org/deliberate/thesaurus/antonyms>