WordWeb Online

1. Marked by sudden changes in subject and sharp transitions
   "abrupt prose";
   - disconnected
    
2. Exceedingly sudden and unexpected
   "came to an abrupt stop"; "an abrupt change in the weather"
    
3. Dangerously steep
   "an abrupt canyon";
   - precipitous, sharp
    
4. Surprisingly and unceremoniously brusque in manner
   "an abrupt reply"

Derived forms: abrupter, abruptest

See also: disconnected, discourteous, ignorant, staccato, steep, sudden

Encyclopedia: Abrupt