a. | 1. | Happening without previous notice or with very brief notice; coming unexpectedly, or without the common preparation; immediate; instant; speedy. | |||
2. | Hastly prepared or employed; quick; rapid. | ||||
3. | Hasty; violent; rash; precipitate. | ||||
adv. | 1. | Suddenly; unexpectedly. | |||
n. | 1. | An unexpected occurrence; a surprise.
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Adj. | 1. | sudden - happening without warning or in a short space of time; "a sudden storm"; "a sudden decision"; "a sudden cure" Antonyms: gradual - proceeding in small stages; "a gradual increase in prices" |