Synonyms|96Antonyms|3|Broader|0Narrower|0Related|4
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not genuine(expression, mock, affected, impromptu)
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not kosher(expression, mock, affected, impromptu)
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off top of head(expression, adjective, idiom, informal, snap)
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on the spot(expression, adjective, idiom, free, casual)
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planter(mock, affected, impromptu)
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snapper(adjective, free, casual, unrehearsed, improvised)
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soft shell(expression, mock, affected, impromptu)
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spur
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spurious(mock, affected, impromptu)
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suppositious(mock, affected, impromptu)
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supposititious(mock, affected, impromptu)
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trumped-up(mock, affected, impromptu)
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unarranged(spontaneous, unprepared, unplanned, unrehearsed, unpremeditated)
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unauthentic(mock, affected, impromptu)
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ungenuine(mock, affected, impromptu)
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vamped(adjective, fake, unprepared, unplanned, unrehearsed)
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APASmart Define. (2015). improviso thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/improviso/thesaurus/synonyms
ChicagoSmart Define. 2015. "improviso thesaurus" https://smartdefine.org/improviso/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, improviso thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/improviso/thesaurus/synonyms>.
MLASmart Define. "improviso thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/improviso/thesaurus/synonyms>