8
accidental(adjective, deliberate, unfixed, unexpectedly)
8
unplanned(adjective, deliberate)
7
incidental
5
unintended
4
casual
4
spontaneous(adjective, impulsive, willing, planned)
4
unintentional(adjective, planned, intentional)
4
unpremeditated
4
unconscious(adjective, ignorant, knowing, automatic)
3
extemporaneous
3
chance
2
involuntary(adjective, intentional)
2
impromptu
2
inadvertent
2
unwitting
2
causeless
2
extemporary
2
extempore
2
fortuitous
2
improvised
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APASmart Define. (2016). intended thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/intended/thesaurus/antonyms
ChicagoSmart Define. 2016. "intended thesaurus" https://smartdefine.org/intended/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, intended thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/intended/thesaurus/antonyms>.
MLASmart Define. "intended thesaurus" 21 March 2016. Web. 24 September 2026. <https://smartdefine.org/intended/thesaurus/antonyms>