A "simple female undercut long hair" hairstyle entails shaving the lower section of hair on the sides and back of the head, while leaving the top hair long. An example is Zendaya's iconic 2018 Met Gala look with closely cropped sides and a voluminous top.
This style offers a striking contrast between short and long hair, creating a modern and edgy look. It's low-maintenance as the shaved section requires minimal styling, and the long hair can be styled in various ways to suit different occasions.