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dead letter

noun

1 dead letter

The state of something that has outlived its relevance.

synonym: non-issue.

Roget 158: impotence; inability, disability; disablement, impuissance, imbecility; incapacity, incapability; inaptitude, ineptitude, incompetence, unproductivity; indocility; invalidity, ... show more

Roget 927: dereliction of duty; fault etc. (guilt) 947; sin etc. (vice) 945; non-observance, non-performance; neglect, relaxation, infraction, ... show more

Roget 738: laxity; laxness, looseness, slackness; toleration etc. (lenity) 740; freedom etc. 748.    anarchy, interregnum; relaxation; ... show more

Roget 517: meaninglessness, unmeaningness etc. adj.; scrabble.    empty sound, dead letter, vox et praeterea nihil [Lat.]; a tale told by an idiot, full of sound and fury, a tale told by an idiot, full of sound and fury, signifying nothing;" sounding brass and a tinkling cymbal.   " nonsense, utter nonsense, gibberish; ... show more

Roget 645: inutility; uselessness etc. adj.; inefficacy, futility; ineptitude, inaptitude; unsubservience; inadequacy etc. (insufficiency) 640; inefficiency, ... show more

2 dead letter

Mail that can neither be delivered nor returned.

synonym: dead mail.


Moby thesaurus: 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 ... show more.

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