"You sound bitter," he said, as though it concerned him.

"You can say that again," I reply, trying not to sound too bitter.

The old doctor sounds a little bitter, and annoyed at me.

He sounded so bitter that she decided not to pursue the matter.

"You sound even more bitter than you did the last time I was here," he told her.

He doesn't sound bitter, just curious and a little bit lonely.

She sounded bitter for the first time since he'd met her.

Not only was that the wrong thing to say, it slipped out sounding bitter.

Her voice sounded bitter for the first time, almost angry.

She didn't sound bitter now; they were resigned to being pushed out of the way.