"Unwashed hair" refers to hair that has not been cleaned with shampoo or water for a certain period of time.
Sentences with «unwashed hair»
This is another hairstyle that works best with unwashed hair because it has more grip, so don't be afraid to skip the shampoo before trying this look! (hairstyle.com)
They're also a good distraction for those second and third day of unwashed hair (thechampagneedit.com)
Actress Olivia Wilde's hairstyle holds best on unwashed hair. (stylecraze.com)