Synonyms|10Antonyms|0|Broader|0Narrower|0Related|0
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impromptu(adjective, unexpected)
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spontaneous(adjective, unexpected)
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surprise(adjective, unexpected)
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unannounced(adjective, unexpected, unrevealed)
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unanticipated(adjective, unexpected, unrevealed)
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undisclosed(adjective, unexpected, unrevealed)
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unexpected
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unheralded(adjective, unexpected)
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unpublished(adjective, unexpected)
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withheld(adjective, unexpected)
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APASmart Define. (1970). not disclosed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/not_disclosed/thesaurus/synonyms
ChicagoSmart Define. 1970. "not disclosed thesaurus" https://smartdefine.org/not_disclosed/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 1970, not disclosed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/not_disclosed/thesaurus/synonyms>.
MLASmart Define. "not disclosed thesaurus" 1 January 1970. Web. 22 September 2026. <https://smartdefine.org/not_disclosed/thesaurus/synonyms>