abrupt in WordNet English dictionary

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