I'm not in the mood. 我没有心情。
例句：
I'm not in the mood to go dancing.
我没有跳舞的心情。
I don't feel well today because I have a terrible headache.I'm not in the mood for being gentle and polite.
我今天觉得不舒服，因为我头很痛。我没法表现出风度和礼貌。
A:Will you come with me to enjoy the classical music？
你要和我一起享受古典音乐吗？
B:Well,I hope you don't mind,but I'm not in the mood to listen to classical music.
我希望你别介意，但是我没有心情听古典音乐。