The guy on the other end of the phone does not sound happy.

In the dark I couldn't see his face well, but he didn't sound happy.

Even by his standards, the coach did not sound happy.

I always tried to sound really happy to put her at ease.

She tried to sound happy, but I could hear the anxiety in her voice.

Vince tried not to sound too happy to have a voice on the line.

When I talked to her the other day, she sounded very happy.

Everyone sounded happy that the first step had been taken at last.

George doesn't sound very happy when he hears that part.

He sounded happy about that fact, and so she didn't ask him to explain.