gamine

1. (of a girl) Having a boyish, mischievous charm; elfish, typically with short hair.Examples: "In her navy linen trousers and her, perhaps too tight, white jersey, Jennifer was determinedly gamine."; "It’s a wildly dated-looking and derivative film, a quaint adventure in fantasised naughtiness, like Ozon’s teen prostitute fantasy Jeune et Jolie in 2013, which starred his lead actress here, Marine Vacth, in a similarly gamine role."