Dead Letter Definition
    noun
  
 A letter that cannot be delivered or returned, as because of incorrect address and lack of return address.
 Webster's New World 
A law, practice, etc. no longer enforced or operative but not formally done away with.
 Webster's New World 
Synonyms: 
  - unmeaningness
 - non-issue
 - dead mail
 
Other Word Forms of Dead Letter
Noun
Singular:
 dead letterPlural:
 dead lettersFind Similar Words
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