expression
as if nothing had happened
Describes a person's demeanor or a situation where someone acts or things appear as though a preceding event (often negative) never occurred. Commonly used with verbs like 振る舞う, 言う, or 続ける.
彼は何事もなかったかのように振る舞った。
He acted as if nothing had happened.
会議では、みんな何事もなかったかのようにいつも通り話し合った。
At the meeting, everyone discussed things as usual, as if nothing had happened.
A fixed expression composed of 何事 (what thing, anything) + も (inclusive particle) + なかった (negative past of ある) + かのように (as if). Literally 'as if nothing had happened.'