Pronunciation: (sud'n),[key] —adj. 1. happening, coming, made, or done quickly, without warning, or unexpectedly: a sudden attack. 2. occurring without transition from the previous form, state, etc.; abrupt: a sudden turn. 3. impetuous; rash.
4. Archaic.quickly made or provided.
—n. 1. Obs.an unexpected occasion or occurrence.
2. all of a sudden, without warning; unexpectedly; suddenly. Also,on a sudden.