i-adjective
thin-haired; having thinning hair
Describes a person with naturally thin or thinning hair. Often used euphemistically.
See also: 髪が薄い
父は年を取って髪の薄くなった。
My father's hair has thinned as he's gotten older.
彼は若い頃から髪の薄
He has been a thin-haired person since he was young.
Compound of 髪 (kami, 'hair') + の (no, possessive particle) + 薄い (usui, 'thin'). The phrase follows a common pattern for describing physical attributes.