Synonyms|241Antonyms|112|Broader|3Narrower|0Related|712
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arrest
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artless(impulsive, impromptu, unprompted, spur-of-the-moment)
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awhile
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brash(thoughtless, impetuous, unwary)
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by chance(expression, chance, unplanned, unpremeditated)
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careless(thoughtless, impetuous, unwary)
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casuals
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cavalier
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coincidental
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collar
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concoctive
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contingency
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contingent(chance, unplanned, unpremeditated)
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crisis
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cuff
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deputy
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dismissive
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emergency
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exigency
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extemporize(informal, unplanned, off-the-cuff, extemporise)
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APASmart Define. (2015). extemporaneous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/extemporaneous/thesaurus/synonyms
ChicagoSmart Define. 2015. "extemporaneous thesaurus" https://smartdefine.org/extemporaneous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, extemporaneous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/extemporaneous/thesaurus/synonyms>.
MLASmart Define. "extemporaneous thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/extemporaneous/thesaurus/synonyms>