57 entries under unplanned topic. ×

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improvise(informal, extemporize, off-the-cuff, extemporise)
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incidental(chance, casual, passing, unpremeditated)
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infrequent(chance, unpremeditated)
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irregular(chance, unpremeditated)
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occasional(chance, unpremeditated)
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odd(chance, unpremeditated)
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played by ear(expression, idiom, unprepared, unrehearsed)
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serendipitous(chance, unpremeditated)
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shot from the hip(expression, idiom, unprepared, unrehearsed)
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thrown off(expression, unprepared, unrehearsed)
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uncertain(chance, unpremeditated)
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unexpected(chance, unpremeditated)
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unforeseen(chance, unpremeditated)
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vamped(unprepared, unrehearsed)
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whipped up(expression, unprepared, unrehearsed)
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winged(unprepared, unrehearsed)
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without restraint(expression, informal, extemporize, off-the-cuff)
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APASmart Define. (2015). extempore thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/extempore/thesaurus/synonyms
ChicagoSmart Define. 2015. "extempore thesaurus" https://smartdefine.org/extempore/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, extempore thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/extempore/thesaurus/synonyms>.
MLASmart Define. "extempore thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/extempore/thesaurus/synonyms>