n.[U]

1. 平滑；流暢
   This diplomat speaks seven languages with great smoothness.

   這位外交官非常流暢地講七種語言。

2. 平靜；平穩；順利
   The voyage of their life has been one of unbroken smoothness.

   他們的人生旅程一直一帆風順。

3. 圓滑；能說會道
   Somehow he was irritated by the smoothness of the salesman.

   不知為什麼這個推銷員的圓滑使他惱怒。