致命的用英语可以说是 "deadly"，它来源于拉丁语中的 "mors" 或 "mortis"，意思是 "死亡"。例如：

The deadly virus swept through the town, killing many people. (这种致命的病毒在城镇中席卷，造成许多人死亡。)

The deadly snake's venom can kill a person within minutes. (这条致命的蛇的毒液可以在几分钟内杀死一个人。)

The deadly disease has no known cure. (这种致命的疾病没有已知的治愈方法。)