薄く

thin; sparse

→ 薄い
薄 thin + く Adverbial form
adjective Rare #35,896
thin; sparse Used when hair or another substance becomes less dense.
JA: 彼の髪はだんだん薄くなってきた。
EN: His hair has gradually started to thin.
Forms of 薄い
薄い薄く

高く昇るにつれて大気は薄くなる。

As you ascend higher, the atmosphere gets thinner.

なんか、髪薄くなってきたんじゃない?

Don't you think your hair's starting to thin?

彼の髪はますます薄くなった。

His hair got thinner and thinner.