niesłusznie Englisch:

The letter was wrongly addressed.

I'm afraid I have addressed the parcel wrongly.

You were wrongly informed. (przed imiesłowem / czasownikiem)

On the other hand, when public officials act wrongly, Americans feel a responsibility to protest.

Her name was wrongly spelled.

Having been wrongly addressed, the letter never reached him.

If it is wrongly used, the medicine will be a poison.