Do you 'sincerely' [='really'] believe that the country is better off now?
Some people are questioning the 'sincerity' of her promises.
I 'sincerely' hope that you do a better job next time.
(..) legitimately, he'll continue to hold it. That fellow is making a lot of sense. You call blackmail sense, Henry? I didn't like this boy to begin with, but no man that wasn't sincere - - could stage a fight like this against all odds. After twenty years work with you you take his word against mine?! (..)1939 Mr. Smith Goes to Washington