"My apologies," said R, and he seemed to be speaking sincerely.
And yet even as he said it he was not quite sure whether he spoke sincerely.
A surprising number try to speak sincerely, only to find themselves teased.
To show that he spoke sincerely, he at once released the Iroquois ambassador.
You are speaking sincerely in that much, at least.
Morgaine knew he spoke sincerely; well, it was nothing to her.
However, because we are among friends, we must speak sincerely.
Let us speak sincerely about the elections, which did not satisfy us.
He spoke bluntly and sincerely about the causes and contexts of the war.
"Sincerely speaking, the invasion was a massacre of the people."