also: ナチュラルメークアップ · ナチュラルメーキャップ · ナチュラルメイキャップ
noun
A makeup style that aims for a natural, barely-there look, emphasizing skin-like finish and subtle enhancement.
from English natural makeup
彼女はいつもナチュラルメイクアップで、あまり化粧しているように見えない。
She always wears natural-look makeup, so it doesn't look like she's wearing much makeup.
ナチュラルメイクアップのコツは、肌をきれいに見せることです。
The key to natural-look makeup is making your skin look beautiful.
More common abbreviation for 'natural makeup'; ナチュラルメイクアップ is the full form, slightly more formal or technical.
Borrowed from English 'natural makeup', with the spelling adapted to katakana.