unordentliches Haar
'messy hair' in french is 'cheveux en désordre'
Translation: Pelo desarreglado
A messy hair gel.
"hair" is "haar" and "hairs" are "haare" in German
Your hair is naturally messy due to genetics and hair type.
Harry Potter has messy jet black hair.
Glattes Haar.
messy, bronze hair
messy, messy, messy
Just put it in a bun, if it is curly, when it is in a bun it will look messy.
Not sure how much my opinion is worth here... even though this will show as an 'expert answer', I have no expertise in this. But I'm gonna say go for the messy bun.
mir gefällt dein Haar is the translation in German. It is translated from English to German. German is mostly spoken in the European countries.