Mince Words Meaning

(idiomatic) To restrain oneself in a conversation by withholding some comments or using euphemisms.

Example: 1848, William Makepeace Thackeray, Vanity Fair, ch. 20:
  "I ask you, William, could I suppose that the Emperor of Austria was a damned traitor—a traitor, and nothing more? I don’t mince words—a double-faced infernal traitor and schemer."
1920, Upton Sinclair, 100%: The Story of a Patriot, ch. 2:
  The detective did not mince words. "It's plain that you're a boob," he said.