なのかい

is it?

→ だ

phrase Rare #26,173

is it? An informal sentence-ending question meaning “is it?” or “are you?” depending on context. Often associated with casual male speech or an old-fashioned style.

JA: 本当に君が行くつもりなのかい？

EN: Are you really planning to go?

彼女はまだ君の事外国人扱いなのかい？

Does she still treat you like a foreigner?

— Article 15 (2019)

でも学校を抜け出したその子なのかい？

But is that the kid who ditched school?

— ほんとうのピノッキオ (2019)

ゆづはまだ姉ちゃんのことが心配なのかい？

Yuzu, are you still worried about your big sister?

— 映画聲の形 (2016)

まだ先なのかい？

Is it still a long way off?

— ロード・オブ・ザ・リング／二つの塔 (2002)

それも演技なのかい？

Is that an act too?

— オープン・ユア・アイズ (1997)

そうなのかい？

Is that so?

— ドライヴ (2011)