A vicious person or a vicious blow is violent and cruel.
He was a cruel and vicious man.
他是一个残忍而凶恶的人。
He suffered a vicious attack by a gang of white youths.
他遭到了一帮白人青年的残暴袭击。
A vicious remark is cruel and intended to upset someone.
It is a deliberate, nasty, and vicious attack on a young man's character.
这是对一位年轻人品格蓄意的、卑鄙的、恶毒的攻击。