abrupt

marked by sudden changes in subject and sharp transitions

• “abrupt prose”

exceedingly sudden and unexpected

• “came to an abrupt stop”
• “an abrupt change in the weather”

extremely steep

• “an abrupt canyon”
• “the precipitous rapids of the upper river”
• “the precipitous hills of Chinese paintings”
• “a sharp drop”

surprisingly and unceremoniously brusque in manner

• “an abrupt reply”