как ни в чём не бывало

as if nothing had happened

→ как
phrase Rare #48,888
as if nothing had happened Used when someone acts normally after something unusual or upsetting.
RU: После ссоры она вернулась домой как ни в чём не бывало.
EN: After the argument, she came home as if nothing had happened.

Том как ни в чём не бывало снова заснул.

Tom fell asleep again as if nothing had happened.

Ты вёл себя как ни в чём не бывало.

You acted as if nothing had happened.