These glorious insults are from an era before the English language got boiled down to 4-letter words.
A member of Parliament to Disraeli: "Sir, you will either die on the gallows or of some unspeakable disease." "That depends, Sir," said Disraeli, "whether I embrace your policies or your mistress."
"He had delusions of adequacy." - Walter Kerr
"He has all the virtues I dislike and none of the vices I admire." - Winston Churchill
"I have never killed a man, but I have read many obituaries with great pleasure." Clarence Darrow
"He has never been known to use a word that might send a reader to the dictionary." - William Faulkner (about Ernest Hemingway).
"Thank you for sending me a copy of your book; I'll waste no time reading it." - Moses Hadas
"I didn't attend the funeral, but I sent a nice letter saying I approved of it." - Mark Twain