Describes hair that has come loose or is messy, often with a slightly poetic or literary feel.
My unkempt hair blew into my face in the wind.
She pushed back her disheveled hair with her hand.
Standard kanji-kana mixed spelling.
Full kanji spelling; less common and may be harder to read.
Compound of ほつれ (from verb 解れる 'to become untangled') + 髪 'hair'. The exact historical derivation is straightforward.