誰も知らないよ。
No one can tell.
全く知らないこと
the state of being totally unfamiliar with something
Nobody knew.
Nobody will be the wiser.
No one knows why.
No one knows that.
Who knows that?
There is no one but knows it.
There is no one but knows it.
Nobody else can know.
Nobody can understand it.
Who can tell?
Nobody knows her name.
Everybody knows that.
あれは知らない人だ