Synonyms|363Antonyms|90|Broader|9Narrower|7Related|1k

63 entries under spontaneous topic. ×

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fly-by-night(unplanned, unpremeditated)
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hit-or-miss(unplanned, unpremeditated)
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off your own bat(expression, idiom, willing, unforced)
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APASmart Define. (2016). impromptu thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/impromptu/thesaurus/synonyms
ChicagoSmart Define. 2016. "impromptu thesaurus" https://smartdefine.org/impromptu/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, impromptu thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impromptu/thesaurus/synonyms>.
MLASmart Define. "impromptu thesaurus" 28 January 2016. Web. 26 September 2026. <https://smartdefine.org/impromptu/thesaurus/synonyms>