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