아니신가

isn't ...?, aren't ...?

→ 아니다
adjective Rare #25,867
isn't ...?, aren't ...? An honorific, often rhetorical question form; it can also be used to recognize someone, like “if it isn’t ...!”
KO: 저분이 새 선생님 아니신가?
EN: Isn't that person the new teacher?
Forms of 아니다

아주 사랑스런 아가씨가 아니신가?

Isn't she a truly lovely young lady?

— 가구야공주 이야기 (2013)

이런 이런 코브라 아니신가 더그, 어떻게 지내?

Well, well, if it isn't Cobra Doug! How have you been?

— 원스 어폰 어 타임 인… 할리우드 (2019)