: in a sincere or truthful way : with truth, genuineness, or straightforwardness
apologizing sincerely
I am sincerely sorry for your loss.
George Clooney, a pleasant man, tries sincerely to give some credibility to Kelvin, and if he doesn't earn our belief, at least he has our sympathy. Stanley Kauffman
The room was quiet until a student in the back of the room let out an enormous belch and said, not too sincerely, "Sorry." E. L. Konigsburg