'Shame' in the Bible

For if I have boasted anything to him about you, I have not been put to shame, but as I have spoken everything to you in truth, thus also our boasting to Titus {has proven to be true}.

For even if I boast somewhat more about our authority that the Lord gave [us] {for building you up and not for tearing you down}, I will not be put to shame,

I say [this] to [my] shame, namely, that we have been weak. But in whatever anyone dares to [boast]--I am speaking in foolishness--I also dare to [boast].