Although Becky Sharp, the ambitious heroine of William Makepeace Thackeray's 1848 novel Vanity Fair, is not usually thought of as innocent or naive, the author used ingenue to describe her as having those qualities. Thackeray's use was attributive: "When attacked sometimes, Becky had a knack of adopting a demure ingenue air, under which she was most dangerous." The word ingenue typically refers to someone who is innocent to the ways of the world, so you probably won't be too surprised to learn that it shares an ancestor—Latin ingenuus—with ingenuous, a word meaning "showing innocent or childlike simplicity and candidness." More directly, our ingenue comes from French ingénue, the feminine form of ingénu, meaning "ingenuous."