mercy的形容词形式翻译前缀

I think her death was a merciful release.

我认为她的'死是一种幸运的解脱。

Eventually the session came to a merciful end.

这次开庭终于有了一个令人解脱的结果。

They asked her to be merciful to the prisoners.

他们要她对犯人慈悲为怀。