abrupt (
http://definr.com/abrupt)
adj 1: marked by sudden changes in subject and sharp transitions;
"abrupt prose" [syn:
disconnected]
2: exceedingly sudden and unexpected; "came to an abrupt stop";
"an abrupt change in the weather"
3: extremely steep; "an abrupt canyon"; "the precipitous rapids
of the upper river"; "the precipitous hills of Chinese
paintings"; "a sharp drop" [syn:
precipitous,
sharp]
4: surprisingly and unceremoniously brusque in manner; "an
abrupt reply"