dead letter

Noun
  1. The state of something that has outlived its relevance (synset 114030306)
    is a type of: state - the way something is with respect to its main attributes
    same as: non-issue
  2. Mail that can neither be delivered nor returned (synset 106639250)
    is a type of: letter, missive - a written message addressed to a person or organization
    same as: dead mail

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