0
precipitously
0
quickened
0
rapidly
0
remarkable(extraordinary, wonderful, shocking, astonishing, astounding)
0
shocking(extraordinary, wonderful, astonishing, astounding)
0
short
0
spasmodic
0
speeded
0
speedily
0
spur-of-the-moment
0
swiftly
0
unanticipatedly
0
unaware
0
unawares
0
unpredictably
0
unprepared
0
unscheduled
11 years ago|9.3k views|share |citing 
APASmart Define. (2015). out of the blue thesaurus. Retrieved September 30, 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 30, 2026).
HarvardSmart Define 2015, out of the blue thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/out_of_the_blue/thesaurus/synonyms>.
MLASmart Define. "out of the blue thesaurus" 3 August 2015. Web. 30 September 2026. <https://smartdefine.org/out_of_the_blue/thesaurus/synonyms>