without warning; abrupt; out of nowhere...
"The kids were working at their desks, when "suddenly" the loud screeching of a fire alarm sounded."posted by null.&.void
av?posted by misty
Since this is not my area of expertise, I searched Google under the key words "suddenly" to get these possible sources:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.posted by PsyDAG