noun which may take the genitive case particle 'no', na-adjective, noun
thinnish; somewhat thin; weakish; rather light; rather pale
Describes something that is on the thin, weak, light, or pale side. Often used for liquids, colors, or flavors.
このコーヒーは薄めですね。
This coffee is rather weak, isn't it?
薄めの色のカーテンを選んだ。
I chose curtains in a rather pale color.
薄い is the base adjective meaning 'thin', 'weak', or 'pale'. 薄め is a noun/adjectival noun meaning 'on the thin side' or 'somewhat thin', expressing a moderate degree.
Derived from the adjective 薄い (usui, 'thin') with the suffix め (me), which indicates a tendency or moderate degree.