noun
racially pure Japanese person
Refers to a person of unmixed Japanese ancestry, often used in discussions of ethnicity or identity. Can carry a slightly formal or analytical tone.
彼は純日本人だが、海外で育ったので日本語が苦手だ。
He is a racially pure Japanese person, but since he grew up abroad, he struggles with Japanese.
この地域には純日本人だけでなく、様々なルーツを持つ人々が住んでいる。
Not only pure Japanese people but also people with various roots live in this area.
Compound of 純 (pure) + 日本人 (Japanese person). The exact origin is uncertain, but it likely emerged in modern contexts discussing ethnic identity.