needless
adjective /ˈniːdləs/
  /ˈniːdləs/
Idioms - (of something bad坏事 不必要的;可以避免的 - needless suffering不必要的痛苦 
- Banning smoking would save needless deaths.禁止吸烟会避免不必要的死亡。 
- The report caused needless anxiety to hundreds of women.报告引起了数百名妇女不必要的焦虑。 
 Collocations DictionaryNeedless is used with these nouns:- anxiety
- death
- suffering
- …
 
- needless suffering
Idioms 
needless to say 
- used to emphasize that the information you are giving is obvious不必说;不用说 - The problem, needless to say, is the cost involved.不用说,问题是所涉及的费用。 
 
- The problem, needless to say, is the cost involved.