Wiktionary
to be honest
phr. (context idiomatic English) frankly, honestly.
Usage examples of "to be honest".
I think you have to be honest with your maker, honest with the people you deal with, and honest with yourself.
Why, when he was trying so hard to be honest, did it feel as though he were lying?
I think - and to be honest I don't see how we can prove it unless Grantchester confesses, which I can't see him doing .
And to be honest, that was when I sensed there was something special about him.