“告发的”的英语可以翻译为：[法] accusatory ...

我不会告发的.I won't spill the beans.对他要多加防备. 他肯定会去告发的.Guard against him. He is bound to tell.另外有些被告发的人起先供认自己是基督徒, 后来又否认.Others who were named by the informer at first confessed themselves Christians, and then denied it....