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dead letter

English

  1. 🔊 mail that can neither be delivered nor returned
  2. 🔊 the state of something that has outlived its relevance

Similar words

dead mail non-issue pastoral epistle aerogram aimlessness air letter airgraph billet-doux bull chain letter dimissorial dimissory letter drop letter emptiness empty sound encyclical fan letter form letter futility inanity insignificance letter of credit letter of introduction letters credential