merciless

1. ADJ If you describe someone as merciless, you mean that they are very cruel or determined and do not show any concern for the effect their actions have on other people. 冷酷无情的

...the merciless efficiency of a modern police state. …现代警察国家冷酷无情的效率。

2. mercilesslyADV 冷酷无情地

We teased him mercilessly. 我们毫不同情地取笑他。