Unstyled

When you were to lazy to style your hair but honey, you still look damn good. Also known as a Down Do. When your hair is not up in a ponytail, pulled back, or anything done to it. This word can also apply to your outfit.

"Her hair is so unstyled, but for some reason, I love it."

unstylize

to simplify something to the point of keeping its original function but losing important style.

Old Chinese Kanji has been unstylized.