An example of abrupt is a driver quickly making a left turn without putting his turn signal on first.
An abrupt change in the weather.
An abrupt leaf.
An example of abrupt is a teacher who always cuts her students off in conversation without ever stopping to listen.
An example of abrupt is a high cliff on the edge of a mountain.
An abrupt answer made in anger.
Origin of abrupt
From American Heritage Dictionary of the English Language, 5th Edition