needless
adjective /ˈniːdləs/
  /ˈniːdləs/
Idioms - (of something bad) not necessary; that could be avoided synonym unnecessary
- needless suffering
 - Banning smoking would save needless deaths.
 - The report caused needless anxiety to hundreds of women.
 
Oxford Collocations DictionaryNeedless is used with these nouns:- anxiety
 - death
 - suffering
 - …
 
 
Idioms 
needless to say 
- used to emphasize that the information you are giving is obvious
- The problem, needless to say, is the cost involved.