Don't tell anyone where you're going.

Keep your mouth shut.

Please don't tell anybody.

We keep it to ourselves.

Can you keep quiet about it?

You can't trust anybody.

I promise no to tell anyone.

not a word to anyone

Do you hear me? Not a word about this to anyone. / Ты меня слышишь? Об этом никому ни слова.

No one wants you here.

Don't tell anyone where you're going.