Sudden

1. n. An unexpected occurrence; a surprise.
2. a. Happening without previous notice or with very brief notice; coming unexpectedly, or without the common preparation; immediate; instant; speedy.
3. a. Hastly prepared or employed; quick; rapid.
4. a. Hasty; violent; rash; precipitate.
5. adv. Suddenly; unexpectedly.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.