n.

1. 不完美[U]
   The imperfection of language makes some ideas hard to express.

   語言功能的不完善使一些思想難於表達。

2. 缺點；瑕疵[C]
   She is tolerant of the little imperfections in her husband's character.

   她能容忍丈夫性格上的這些小小瑕疵。