treacherous

1. ADJ If you describe someone as treacherous, you mean that they are likely to betray you and cannot be trusted. 背信棄義的[表不滿]

He publicly left the party and denounced its treacherous leaders. 他公開脫離了該黨，竝遣責黨內那些背信棄義的領導人們。

2. ADJ If you say that something is treacherous, you mean that it is very dangerous and unpredictable. 危險的; 變化莫測的

The current of the river is fast flowing and treacherous. 河水的水流湍急而且變化莫測。