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.和以往一樣，惠斯勒還是那么冷酷無情。...the merciless efficiency of a modern police state.現(xiàn)代極權國家殘酷無情、只講效率
英漢詞典釋義
adj.
無情的,殘忍的
a merciless judge冷酷的法官merciless punishment冷酷的處罰
英英詞典釋義
Adjective
1. having or showing no mercy;
"the merciless enemy""a merciless critic""gave him a merciless beating"