상관없잖아

doesn't matter, is irrelevant, has nothing to do with

→ 상관없다
상관 matter, concern + 없 not have, be without; be absent, not exist + 잖아 Reminding / shared knowledge
adjective Rare #18,295
doesn't matter, is irrelevant, has nothing to do with The conversational ending -잖아 points out something the speaker assumes the listener knows, often seeking agreement.
KO: 그건 상관없잖아.
EN: That doesn't matter, you know.
Forms of 상관없다

그놈의 학교, 학교 안 가도 별로 상관없잖아

That stupid school—it’s not like it matters if I don’t go anyway.

— 아무도 모른다 (2004)

몰라, 상관없잖아

I don't know. It doesn't matter anyway.

— 라라랜드 (2016)

상관없잖아

It doesn't matter, does it?

— 롤라 런 (1998)

그건 상관없잖아

That doesn't matter.

— Unlocked (2023)

상관없잖아?

It doesn't matter, right?

— 미스틱 리버 (2003)

너 랑은 상관없잖아?

It doesn't have anything to do with you, right?

— 아키라 (1988)