Definitions of abrupt:

• adjective:   marked by sudden changes in subject and sharp transitions

  Example: "Abrupt prose"

• adjective:   surprisingly and unceremoniously brusque in manner

  Example: "An abrupt reply"

• adjective:   exceedingly sudden and unexpected

  Example: "Came to an abrupt stop"

• adjective:   extremely steep

  Example: "An abrupt canyon"