Sudden, without ceremony, like the arrival of a cannon- shot and the departure of the soldier whose interests are most affected by it. Dr. Samuel Johnson beautifully said of another author's ideas that they were "concatenated without abruption."
Without notice to prepare the mind for the event; sudden; hasty; unceremonious.
Having sudden transitions from one subject to another; unconnected.
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"
surprisingly and unceremoniously brusque in manner; "an abrupt reply"