abrupt
adj.
1580s, from Latin abruptus "broken off, precipitous, disconnected," past participle of abrumpere "break off," from ab- "off" (see ab-) + rumpere "break" (see rupture, n.). Related: Abruptly; abruptness.
〔李〕[ab-=off分离；rupt =to break破，裂→“to break off分裂；分离”→] a.① very sudden or unexpected, as if broken off（像断离似的）突然的；出其不意的