If you describe a violent action as mindless, you mean that it is done without thought and will achieve nothing.
a plot that mixes blackmail, extortion, and mindless violence.
一个集合了敲诈、勒索和盲目暴力的阴谋。
If you describe a person or group as mindless, you mean that they are stupid or do not think about what they are doing.
She wasn't at all the mindless little wife so many people perceived her to be.
她可不是那么多人所认为的没头脑的小媳妇。
If you describe an activity as mindless, you mean that it is so dull that people do it or take part in it without thinking.
the mindless repetitiveness of some tasks.
一些任务的单调重复。