lummy

Lummy is a British slang term that's been used in two flavors. In one sense it means shrewd, knowing, or cute — describing someone who's got a sharp, canny quality about them. In its older, more obsolete British use, it meant jolly or first-rate — something that was simply top-notch and excellent. Both senses suggest a kind of sparkly, positive quality. The word has largely fallen out of everyday use, surviving mainly in historical fiction and the vocabulary of people who love vintage British slang.