If an event or experience is anticlimactic it causes disappointment because it was less exciting than was expected, or happened immediately after a much more exciting event or experience

There was so much publicity and hype beforehand that the performance itself was a touch anticlimactic. 事先有如此多的宣传和炒作，以至于表演本身有点虎头蛇尾的感觉。

I thought the movie had a disappointing and anticlimactic ending. 我认为这部电影的结局令人既失望又扫兴。