| startling(extraordinary, wonderful, shocking, astonishing, astounding) | |
| stunning(extraordinary, wonderful, shocking, astonishing, astounding) | |
| uncalculated(adjective, surprise, unexpected, sudden) | |
| unlikely(adverb, not expected, not planned, unhoped, uncontemplated) | |
| unlooked for(adjective, surprise, unexpected, sudden) | |
| unpredictable(extraordinary, wonderful, shocking, astonishing, astounding) | |
| untimely(adverb, not expected, not planned, unhoped, uncontemplated) | |
| aback | |
| abruptly | |
| ad hoc(expression, unprepared) | |
| asudden | |
| expeditious | |
| extraordinary(wonderful, shocking, astonishing, astounding) | |
| fleet | |
| forthwith | |
| impromptu | |
| on spur of moment | |
| precipitant | |
| precipitate | |
| precipitous |
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Out_of_the_blue on
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| APA | Smart Define. (2015). out of the blue thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/out_of_the_blue/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "out of the blue thesaurus" https://smartdefine.org/out_of_the_blue/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, out of the blue thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/out_of_the_blue/thesaurus/synonyms>. |
| MLA | Smart Define. "out of the blue thesaurus" 3 August 2015. Web. 30 September 2026. <https://smartdefine.org/out_of_the_blue/thesaurus/synonyms> |