Definition of Dead letter

1. Noun. The state of something that has outlived its relevance.

Exact synonyms: Non-issue
Generic synonyms: State

2. Noun. Mail that can neither be delivered nor returned.
Exact synonyms: Dead Mail
Generic synonyms: Letter, Missive

Lexicographical Neighbors of Dead Letter

dead animal
dead axle
dead body
DEAD box helicase
dead center
dead centre
dead drop
dead duck
dead end
dead fingers
dead foetus syndrome
dead hand
dead hand of the past
dead heat
dead language
dead letter (current term)
dead load
dead mail
dead march
dead metaphor
dead nerve
dead nettle
dead on target
dead person
dead pulp
dead reckoning
dead ringer
dead room
Dead Sea
Dead Sea scrolls

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