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1·Banning smoking would save needless deaths.

禁止吸烟会免除不必要的死亡。《牛津词典》

2·The problem, needless to say, is the cost involved.

不用说，问题是所涉及的费用。《牛津词典》

3·They greet their children's teenage with needless dread.

他们怀着不必要的恐惧迎接孩子们的青春期。

4·They greet their children's teenage with needless dread.

他们怀着不必要的恐惧迎接孩子们的青春期。

5·Needless to say, I felt very embarrassed in assuming he had his dates mixed up.

不用说，光假设他已经把约会给弄毁了，我就已经感到十分尴尬了。

6·But his death was so needless.

然而他的死却太没有必要了。《柯林斯英汉双解大词典》

7·All this, needless to say, had been culled second-hand from radio reports.

不必说，这一切都是从无线电广播报道中搜集来的第二手信息。《柯林斯英汉双解大词典》

8·Needless to say, I suffered a lot.

不用说，我受了很多苦。

9·Needless to say, I agree.

无须说，我是同意的。《新英汉大辞典》

10·So much needless repetition makes the article long-winded.

这样叠床架屋，文章就太罗嗦了。《新英汉大辞典》

不必要

1·Banning smoking would save needless deaths.

禁止吸烟会免除不必要的死亡。《牛津词典》

2·They greet their children's teenage with needless dread.

他们怀着不必要的恐惧迎接孩子们的青春期。

3·They greet their children's teenage with needless dread.

他们怀着不必要的恐惧迎接孩子们的青春期。

4·Much of this suffering is needless.

这些苦难中许多都是不必要的。

5·This caused a great deal of confusion and needless market fragmentation — which, in turn, impeded the adoption of the useful new paradigm.

这样就导致了令人难以理解以及不必要的市场分歧—反过来也阻碍了有实用价值的新模式的采用。

多余的

1·Along with advice about the passive voice and keeping your writing in the same verb tense is this often-quoted axiom: omit needless words.

和在写作中对被动语态的建议及要保持时态一致一样被经常引用的还有：删掉多余的单词。

2·With his extraordinary power, he then pulled his supernatural bow and shot 9 needless SUNS down on the peak of Mount Kunlun.

凭借着他无与伦比的力量，他在昆仑山拉出了他的神弓并将9个多余的太阳射下。

不需要的

1·To answer this question, I feel needless to say that nowadays, as a world-wide spoken language, how important English is.

回答这一问题，我觉得不需要去说现如今的英语，作为世界上广泛使用的语言，有多么重要。

2·If one is enough, a second although useful is needless.

如果一个够了，那么第二个即使有用，也是不需要的。

(1)needless to say不用说