| spontaneous(adjective, impulsive, willing) | |
| unplanned(adjective, planned) | |
| accidental(adjective, deliberate, unexpectedly) | |
| offhand(adjective, careless, careful, abrupt, extemporaneous) | |
| extemporaneous(adjective, improvised, rehearsed) | |
| eye-opening | |
| happy | |
| ad-lib(adjective, adverb, manner, rehearsed) | |
| impromptu(adjective, adverb, deliberate, unrehearsed, improvised) | |
| inadvertent(adjective, accidental) | |
| casual(adjective, deliberate, chance, random) | |
| chance(adjective, accidental, unforeseeable) | |
| extemporary | |
| fortuitous(adjective, lucky, accidental) | |
| improvised | |
| haphazard(adjective, organization, plan) | |
| rash(adjective, reasonable, sensible, careless, impulsive) | |
| spur-of-the-moment | |
| impulsive(adjective, cautious) | |
| involuntary |
For more, visit
Planned on
Power Thesaurus
| APA | Smart Define. (2016). planned thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/planned/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "planned thesaurus" https://smartdefine.org/planned/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, planned thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/planned/thesaurus/antonyms>. |
| MLA | Smart Define. "planned thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/planned/thesaurus/antonyms> |