I had a nasty feeling that a tragedy was going to happen.

【nasty，nastily，nastiness】我有一种非常糟的感觉，一场悲剧将要发生。

Malfoy, Crabbe, and Goyle weren't listening; they were talking in an undertone and Harry had a nasty feeling they were plotting how best to disrupt the lesson.

马尔福、克拉布和高尔并没有听，他们在低声说话；哈利有一种极不愉快的感觉，那就是他们在想办法破坏这堂课。