"I'm not interested in money anymore," she said with perfect sincerity.

With a vaguely surprised expression and perfect sincerity, he said, "I don't know.

And I said it with perfect sincerity, but his intense, inquiring look made me uncomfortable.

With perfect sincerity, she was able to say, "I hope your business is concluded satisfactorily before long."

'I'm glad you're all right,' I said with perfect sincerity.

"I hate irony," he said with, for once, perfect sincerity.

I declared, with perfect sincerity, that there was no fear of a mistake.

A glance, however, at his countenance, convinced me of his perfect sincerity.

His words were uttered with perfect sincerity; humans would have said, He has spoken from the heart.

He spoke with perfect sincerity; that was the way to locate the Ancient Site.