They seem sincere but unaware of finer upper class Victorian manners.

"I think it was done in a sincere manner."

Not at all," he said in a sincere, if disarming, manner.

"I'm certain that I speak for both of us," the American said in his usual sincere manner.

And although the police question a neighbor, a single man who builds dollhouses, nothing criminal is detected in his sincere manner.

The captain chuckled in his most sincere and diplomatic manner.

The old man liked the boy's open, sincere manner, and decided to play along.

As I said, he spoke in a brotherly, sincere manner.

Then they succumbed to his sincere gaze and sympathetic manner.

People who try to block discussion about substantial issues raised in a sincere and considered manner are a menace to politics.