Synonyms|744Antonyms|104|Broader|6Narrower|5Related|904

53 entries under unexpected topic. ×

6
expeditious(adjective, fast, quick, abrupt, rapid)
6
fleet(adjective, fast, quick, abrupt, rapid)
4
impromptu(adjective, impulse, quickly)
4
out of the blue(expression, adjective, idiom, wonderful, abrupt)
4
rushing(adjective, violent, fierce, quick, ardent)
3
astonishing(adjective, extraordinary, wonderful, shocking, astounding)
3
spasmodic(adjective, quickly)
3
unpredicted(extraordinary, wonderful, shocking, astonishing, astounding)
2
flash(adjective, impulse, quickly)
2
jerky
1
accidental(extraordinary, careless, wonderful, casual, shocking)
1
alacritous(adjective, summary, abrupt, rapid)
1
barrelling(summary, abrupt, rapid, instant)
1
cracking(summary, abrupt, rapid, instant)
1
double-quick(summary, abrupt, rapid, instant)
1
fleet-footed(summary, abrupt, rapid, instant)
1
flying(fast, brief, summary, abrupt, swift)
1
from left field(expression, idiom, extraordinary, wonderful, shocking)
1
in nothing flat(expression, idiom, summary, abrupt)
1
like crazy(expression, summary, abrupt, rapid)
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ChicagoSmart Define. 2016. "sudden thesaurus" https://smartdefine.org/sudden/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, sudden thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sudden/thesaurus/synonyms>.
MLASmart Define. "sudden thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/sudden/thesaurus/synonyms>