Synonyms|50Antonyms|3|Broader|0Narrower|0Related|5
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off-guard(ignorantly, unwatchful)
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on spur of moment(expression, idiom, ignorantly, unanticipatedly, uniformed)
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on the hop(expression, idiom, adverb, suddenly, unexpectedly)
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unalert(ignorantly, unwatchful)
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unanticipatedly(adverb, suddenly, unexpectedly, unawares, abruptly)
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unaware(adverb, suddenly, unexpectedly, unawares, abruptly)
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unawarely(adverb, prepared)
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uniformed
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unwatchful
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without delay(expression, adverb, suddenly, unexpectedly, unawares)
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without hesitation(expression, adverb, suddenly, unexpectedly, unawares)
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APASmart Define. (2015). by surprise thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/by_surprise/thesaurus/synonyms
ChicagoSmart Define. 2015. "by surprise thesaurus" https://smartdefine.org/by_surprise/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, by surprise thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/by_surprise/thesaurus/synonyms>.
MLASmart Define. "by surprise thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/by_surprise/thesaurus/synonyms>