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impromptu(adjective, adverb, deliberate, improvised)
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APASmart Define. (2016). planned thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/planned/thesaurus/antonyms
ChicagoSmart Define. 2016. "planned thesaurus" https://smartdefine.org/planned/thesaurus/antonyms (accessed October 1, 2026).
HarvardSmart Define 2016, planned thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/planned/thesaurus/antonyms>.
MLASmart Define. "planned thesaurus" 26 February 2016. Web. 1 October 2026. <https://smartdefine.org/planned/thesaurus/antonyms>