He sounded almost regretful, but that wouldn't stop him.

There was a brief pause and then his voice came back, sounding regretful.

She wished her voice did not sound regretful or uncertain.

"On my desk today, Barney," she said, trying to sound regretful.

'Your brother has ideas, you know,' he said, sounding regretful.

"Don't sound so regretful," the man who had first spoken to me said.

"I'm afraid these boots may be beyond cleaning, sir," Thomas reported, trying to sound regretful about it.

"The city records go back five millennia," the machine said, sounding regretful.

Paris didn't sound particularly regretful, but Janeway seemed to take his words at face value.