sudden

adjectives

happening without warning or in a short space of time
"a sudden storm"; "a sudden decision"; "a sudden cure"
sudden
is derived from
suddenness
antonym
gradual
is similar to
exceedingly sudden and unexpected
"came to an abrupt stop"; "an abrupt change in the weather"
abrupt
is similar to
marked by abrupt transitions
"choppy prose"
choppy, jerky
is similar to
occurring unexpectedly and requiring urgent action
"emergent repair of an aorta"
emergent
is similar to
sudden and loud
"an explosive laugh"
explosive
is similar to
sudden and severe
"fulminant pain"; "fulminant fever"
fulminant
is similar to
very sudden and in great amount or degree
"a sharp drop in the stock market"
sharp
see also
acting or moving or capable of acting or moving quickly
"fast film"; "on the fast track in school"; "set a fast pace"; "a fast car"
fast