Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun dead_letter

2 senses of dead letter

Sense 1
dead letter, non-issue -- (the state of something that has outlived its relevance)
       => state -- (the way something is with respect to its main attributes; "the current state of knowledge"; "his state of health"; "in a weak financial state")

Sense 2
dead letter, dead mail -- (mail that can neither be delivered nor returned)
       => letter, missive -- (a written message addressed to a person or organization; "mailed an indignant letter to the editor")