a.

1. 突然的；意外的
   The abrupt change of schedule gave me lots of trouble.

   行程突然改变给我造成许多麻烦。

2. （态度等）唐突的，鲁莽的
   She was offended by his abrupt manner.

   他粗率无礼的举止触怒了她。

3. 陡峭的，险峻的
   She did not dare to bike down the abrupt slope.

   她不敢骑着自行车冲下陡峭的斜坡。

4. （文章风格等）不连贯的

adj.

1. sudden and unexpected.
2. brief to the point of rudeness; curt.
3. (of a slope) steep.