Synonyms|74Antonyms|10|Broader|1Narrower|0Related|252
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extempore
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from left field(expression, idiom, secret)
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immediate
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impetuous
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impulsive
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informal
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not bargained for(expression, idiom, secret)
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not disclosed
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off the cuff
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off the record
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offhand
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phenomenal
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pop-up
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rapid
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rash
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remarkable
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sensational
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spur-of-the-moment
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staggering
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startling
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APASmart Define. (2015). unannounced thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unannounced/thesaurus/synonyms
ChicagoSmart Define. 2015. "unannounced thesaurus" https://smartdefine.org/unannounced/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unannounced thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unannounced/thesaurus/synonyms>.
MLASmart Define. "unannounced thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/unannounced/thesaurus/synonyms>