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off the top of one's head(adjective, adverb, preparation)
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off top of head(expression, idiom, informal, snap, impromptu)
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passing
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personally(secretly, privately, confidentially)
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pick-up
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privately(secretly, personally, confidentially)
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rough
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secretly
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spontaneously(adverb, impromptu, improv, extemporaneously)
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sub rosa(expression, secretly, personally, privately, confidentially)
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surprised(unqualified, unsuspecting, unready)
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throwaway(impromptu, extemporaneous)
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unannounced
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unaware(unqualified, unsuspecting, unready)
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unconscious
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uncontrived
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unexpected(unqualified, unsuspecting, unready)
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uninhibited(adjective, free, easy, restraint)
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unpracticed(impulsive, spontaneous)
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unqualified(unsuspecting, unready)
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APASmart Define. (2015). off the cuff thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/off_the_cuff/thesaurus/synonyms
ChicagoSmart Define. 2015. "off the cuff thesaurus" https://smartdefine.org/off_the_cuff/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, off the cuff thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/off_the_cuff/thesaurus/synonyms>.
MLASmart Define. "off the cuff thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/off_the_cuff/thesaurus/synonyms>