않은가

not

→ 않다
않 not (forms a negation after -지) + 은가 Interrogative ending
auxiliary Uncommon #11,657
not Used after -지 to form a negative question, often rhetorical.
KO: 이 음식은 맵지 않은가?
EN: Isn't this food spicy?
Conjugation of 않다

혹시 운이 따를 수도 있지 않은가?

Maybe luck will be on our side.

모습을 보이고 싶지 않은가 봐요

It seems like they don't want to be seen.

— 연인 (2004)

괜찮지 않은가?

Isn't it okay?

— 잠입자 (1979)

그렇지 않은가?

Isn't that so?