"Don’t worry, Mr. Rearden," said an unctuous voice over a long distance telephone line from Washington, "I just wanted to assure you that you will not have to worry."
At a signal from Wesley Mouch, his voice boomed suddenly over the prairie, an unctuous, fraudulently solemn voice magnified by the microphone inventor’s ingenuity into the sound and power of a giant: "Ladies and gentlemen …. !
There are no more uses of "unctuous" in the book.
Show samples from other sources
But she kept her attention on me, unctuously gesturing, and even as he leaned and bucked into her she held out her open hand to me, as if I should take it when I crept my way inside.
Chang-rae Lee -- A Gesture Life
He made no effort to be civil, or his normal unctuous, ingratiating self.