心灰意冷 ------ be in black despair

例句：
A: You're his patron. How come he betrayed you?
你是他的恩人，为何他还出卖了你？
B: Maybe he was insane. I'm really in black despair.
也许他疯了。我真的感到心灰意冷。

同义词：
down in the bushes
in the dumps
lose heart