sudden

Anything sudden is abrupt, quick, or unexpected. A sudden rain shower during your picnic is disappointing, while a sudden drop-off in the road ahead can be dangerous if you're on your skateboard.

The stock market might take a sudden dive, panicking investors, or your favorite TV show could make a sudden change in plot, confusing you for a couple of episodes. Sudden has been used as an adjective since the 15th century, and it was once a noun, too, meaning "that which is sudden." Today the noun form is obsolete, except in the phrase "all of a sudden."

Definitions of sudden
  1. adjective
    happening without warning or in a short space of time
    “a sudden storm”
    “a sudden decision”
    “a sudden cure”
    Synonyms:
    fast
    acting or moving or capable of acting or moving quickly
    abrupt
    exceedingly sudden and unexpected
    choppy, jerky
    marked by abrupt transitions
    emergent
    occurring unexpectedly and requiring urgent action
    explosive
    sudden and loud
    fulminant
    sudden and severe
    sharp
    very sudden and in great amount or degree
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    Antonyms:
    gradual
    proceeding in small stages
    slow
    not moving quickly; taking a comparatively long time
    bit-by-bit, in small stages, piecemeal, step-by-step, stepwise
    one thing at a time
    gradational, gradatory, graduated
    taking place by degrees
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