His hair, sparse and unkempt of growth, was as indeterminate and colorless as his complexion.

His hair hung black and unkempt about his burning eyes.

By three in the afternoon I was as unkempt as any tinker, my hair plastered over my eyes, and every fold of my coat running like a gutter.

Unkempt for Disordered, Untidy, etc.

And then, though she was ill-dressed, untidy, almost unkempt on occasions, still, through it all, there was something attractive about her.