国王发现他的顾问背叛了他，是个不忠的叛徒。

The king discovered that his advisor was a ___faithless traitor.

在这个信仰缺失的社会，许多人不再相信上帝的存在。

In this ___faithless society, many people no longer believe in the existence of God.

那个不可靠的助手又一次忘记提交重要文件。

The ___faithless assistant forgot to submit the important documents again.