52 entries under adjective topic. ×

13
sudden(extraordinary, wonderful, shocking, surprise)
10
unforeseen(adverb, surprise, unexpected, surprising)
10
unanticipated(adverb, surprise, unexpected, surprising)
8
abrupt(unexpected, sudden, surprising)
8
eye-opening(amazing, shocking, surprise, astonishing)
6
all of a sudden(expression, idiom, surprising, not expected)
6
impetuous(sudden, unlooked-for, unhoped)
6
impulsive(extraordinary, wonderful, quick, shocking)
5
brusque(sudden, surprising, unlooked-for)
5
fast(sudden, surprising, unlooked-for)
5
hasty(sudden, unlooked-for, unhoped)
5
rapid(sudden, surprising, unlooked-for)
5
unexpected(adverb, surprise, surprising, unpredicted)
4
quick(sudden, surprising, unlooked-for)
4
swift(sudden, surprising, unlooked-for)
4
accelerated(sudden, unlooked-for, unhoped)
4
all at once(expression, idiom, surprising, not expected)
4
headlong(sudden, unlooked-for, unhoped)
4
hurried(sudden, unlooked-for, unhoped)
4
immediate(sudden, unlooked-for, unhoped)
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APASmart Define. (2015). out of the blue thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/out_of_the_blue/thesaurus/synonyms
ChicagoSmart Define. 2015. "out of the blue thesaurus" https://smartdefine.org/out_of_the_blue/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, out of the blue thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/out_of_the_blue/thesaurus/synonyms>.
MLASmart Define. "out of the blue thesaurus" 3 August 2015. Web. 29 September 2026. <https://smartdefine.org/out_of_the_blue/thesaurus/synonyms>