既然如此

since that's the case

→ 既然

phrase Rare #21,401

since that's the case Used to introduce a conclusion or suggestion based on what was just said; often followed by 那就, meaning “then...” or “in that case...”

CH: 既然如此，那我们就早点回家吧。

EN: Since that's the case, let's go home early.

既然如此

Since that's the case.

— 鬼灭之刃：无限列车篇 (2020)

既然如此为什么不报警？

If that's the case, why not call the police?

— 我要复仇 (2002)

既然如此你不是需要工作吗

In that case, don't you need to work?

— 天气之子 (2019)

既然如此那就好

In that case, that's good.

— 铃芽之旅 (2022)