残酷的用英语可以说是cruel. 来源是从拉丁语的cruelis中，其意思是“残忍的，冷酷的”。例句：

He was a cruel dictator who oppressed his people. (他是一个残忍的独裁者，压迫他的人民。)

The animals were subjected to cruel experiments in the laboratory. (动物在实验室里遭受了残酷的实验。)

It was a cruel twist of fate that she lost her job just when she needed it the most. (命运残酷地是她在最需要工作的时候失去了工作。)