De mortuis nil nisi bonum
Latin phrase

The Latin phrase De mortuis nil nisi bonum dicendum est, "Of the dead nothing but good is to be said." — abbreviated Nil nisi bonum — is a mortuary aphorism indicating that it is socially inappropriate for the living to speak ill of the dead who cannot defend or justify themselves.
The full Latin sentence is usually abbreviated into the phrase (De) Mortuis nihil nisi bonum, "Of the dead, [say] nothing but good."; whereas free translations from the Latin function as the English aphorisms: "Speak no ill of the dead," "Of the dead, speak no evil," and "Do not speak ill of the dead."
Attributed to Chilon of Sparta, who was one of the Seven Sages of Greece, the aphoristic recommendation about not speaking ill of the dead was first recorded in Classical Greek, as: τὸν τεθνηκóτα μὴ κακολογεῖν ("Of the dead do not speak ill."), in chapter 70 of Book 1 of Lives and Opinions of Eminent Philosophers, by Diogenes Laërtius, in the 3rd century AD. The Latin version of the Greek mortuary phrase dates from the translation of the book by Diogenes Laërtius, by the humanist monk Ambrogio Traversari in 1443.
Usages
Literary
Novels
In The Last Chronicle of Barset (1867), by Anthony Trollope, after the sudden death of the Bishop's wife, the Archdeacon describes De mortuis as a proverb "founded in humbug" that only need be followed in public and is unable to bring himself to adopt "the namby-pamby every-day decency of speaking well of one of whom he had ever thought ill."
In The Power-House (1916), by John Buchan, the hero, Sir Edward Leithen, says "De mortuis & c.", in reference to the dead villain.
In Murder Must Advertise (1933), by Dorothy L. Sayers, a character is asked about a recently deceased coworker and replies, "De mortuis, and all that, but I wasn't exactly keen on him." In her 1937 novel Busman's Honeymoon, Lord Peter Wimsey says "De mortuis, and then some," in response to the fact that no one they've met has had anything positive to say about the murder victim.
In Player Piano (1952), by Kurt Vonnegut, the phrase is used by the narrator after describing individuals "with nothing to lose anyway, men who had fallen into disfavor one way or another, who knew they had received their last invitation" to the Meadows.
In Deus Irae (1976), by Philip K. Dick and Roger Zelazny, Father Handy thinks of the phrase in reference to millions of people killed by nerve gas. He then subverts the phrase to "de mortuis nil nisi malum" in blaming them for complacently voting in the politicians responsible.
In McNally's Dilemma (1999) by Lawrence Sanders and Vincent Lardo, McNally uses the full phrase and defines it as "say nothing but good of the dead."
In Lonely Road (1932) by Nevil Shute, when the hero, Stevenson, confronts the plot mastermind, Ormsby, and consequently Ormby realises that his game is up and his only way out is suicide, quoting the phrase.
Short stories
In "De Mortuis" (1942), by John Collier, after an unwitting cuckold is accidentally informed of his wife's infidelities, he plans an opportunistic revenge; the titular phrase, de mortuis, implies the murderous ending of the story.
In "What the Dead Men Say" (1964), by Philip K. Dick, after the main character has spoken ill of his recently deceased boss, his wife tells him "Nil nisi bonum", then explaining to her bamboozled husband that it comes from the classic cartoon "Bambi".
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