Crossword Genius

Happening quickly and without warning (6)

Ross

I believe the answer is:

sudden

'happening quickly and without warning' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sudden that I've seen before include "Swift" , "Quickly, without notice or warning" , "Happening quickly and without warning" , "Occurring quickly without warning" , "Immediate and surprising" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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