Something that is needless is completely unnecessary.
But his death was so needless.
然而他的死却太没有必要了。
It has taken many centuries of needless suffering to close the gap of medical ignorance.
许多世纪以来,由于医学认识上的不足,人类已经承受了许多无谓的苦难。
needless to say
You use needless to say when you want to emphasize that what you are about to say is obvious and to be expected in the circumstances.
Soon the story was in all the papers, and the book, needless to say, became a best-seller.
不久这个故事就见诸各大报端,不用说,这本书也成了畅销书。
Needless to say, the differences in diet between these two populations goes far beyond the amount of fat in it.
不必说,这两类人群饮食上的区别远不止脂肪含量不同这一项。
Our budgie got out of its cage while our cat was in the room. Needless to say, the cat moved quicker than me and caught it.
我们的虎皮鹦鹉飞出笼子的时候,猫正在屋里。不用说,猫的动作比我快,逮住了它。