않은 거야

didn't ...?

→ 않다
phrase Rare #19,207
didn't ...? Used with a verb or adjective to emphasize or ask for an explanation about a negative situation. The subject and the specific meaning of the preceding expression depend on context; for example, 하지 않은 거야? means “didn't you do it?” and 무섭지 않은 거야? means “aren't you scared?”
KO: 왜 미리 말하지 않은 거야?
EN: Why didn't you tell me earlier?

바다가 무섭지 않은 거 야?

Aren't you afraid of the sea?

— 공각기동대 (1995)

막지 않은 거 야?

Why didn't you stop it?

— 영웅 (2002)

왜 나를 도와주지 않은 거 야?

Why didn't you help me?