unctuous

This is one of those words that starts in a very practical place: a hand dipped in oil, a priest’s forehead marked for a rite, a cook glossing a dish so it gleams. Latin had ungere, “to anoint,” and from its participle unctus came unctuosus, literally something drenched in ointment. Then English borrowed it in the late 1300s for anything greasy or soapy, before the language did its favorite sneaky move and turned a physical texture into a moral judgment. By the 1700s, an unctuous person was not just slick — they were the human equivalent of a spoon coated in butter: overly smooth, faintly nauseating, impossible to trust. It lives in the same family as unction, unguent, and even the idea of a holy anointing, which makes the insult feel even sharper: a word that began with sacred oil ended up describing someone who is all lubrication and no sincerity.