这么严肃

so serious

→ 这么
phrase Rare #23,520
so serious Used to describe someone or something as excessively serious, or to react to how serious they seem. 这么 means “so” or “this” before an adjective.
CH: 你不用这么严肃,我们只是开个玩笑。
EN: You don't have to be so serious; we're just joking.

这么严肃

Why so serious?

— 普通女人 (2017)

我想问你你干嘛老是这么严肃

Why are you always so serious?

— 猫鼠游戏 (2002)

这么严肃赖讷

Don’t be so serious, Rainer.

— 浪潮 (2008)

这么严肃的时候你这狗娘养的臭小子

At a time this serious, you son of a bitch...

— 哭声 (2016)

好啦你别这么严肃看起来很丑

Alright, don’t be so serious—you look ugly.

— 痛苦与荣耀 (2019)