For the things that are done by them in secret are shameful, even to mention.
For it is a shame even to speak of those things which are done of them in secret.
For it is a shame even to speak of or mention the things that [such people] practice in secret.
for the things which are done by them in secret it is a shame even to speak of.
It’s embarrassing to even talk about what certain persons do in secret.
For the things that are done by them in secret, it is a shame even to speak of.