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.
例句
Whistler, as always, was merciless.和以往一样,惠斯勒还是那么冷酷无情。...the merciless efficiency of a modern police state.现代极权国家残酷无情、只讲效率
英汉词典释义
adj.
无情的,残忍的
a merciless judge冷酷的法官merciless punishment冷酷的处罚
英英词典释义
Adjective
1. having or showing no mercy;
"the merciless enemy""a merciless critic""gave him a merciless beating"