She had mentioned immediately on his entering that Will had just gone away, and would come again, but Mr. Casaubon had said, "I met him outside, and we made our final adieux, I believe," saying this with the air and tone by which we imply that any subject, whether private or public, does not interest us enough to wish for a further remark upon it.
There are no more uses of "adieu" in the book.
Show samples from other sources
Only adieu, mon plaisir, may we meet again.
Fyodor Dostoyevsky -- Crime and Punishment
You can perhaps think it is a little thing, Stingo, but it is to permit someone to die without a farewell, an adieu, a single word of comfort or understanding that is so terrible to bear.