1.I’m so depressed.我很郁闷；

2.I feel so upset.我觉得很沮丧；

3.I‘m in a bad mood today. / I’m moody today我今天心情不好；

4. I feel low today我今天心情(有点)低落;

5.I‘m a bit down in the mouth today我今天有点闷闷不乐的。

6)depressed 沮丧的
I'm feeling really depressed today.我今天很郁闷。

7)feel blue
I felt blue when I failed.
我失败后感到郁郁不乐。

8)down in the dumps
Why is he so down in the dumps? oh,he just broke up with his GF 他为什么那么郁闷呢？哦!他刚和他女友分手了.