…wish to walk along it once more, all were so inclined, and Louisa soon grew so determined, that the difference of a quarter of an hour, it was found, would be no difference at all; so with all the kind leave-taking, and all the kind interchange of invitations and promises which may be imagined, they parted from Captain and Mrs Harville at their own door, and still accompanied by Captain Benwick, who seemed to cling to them to the last, proceeded to make the proper adieus to the Cobb.
…reflections as these, on a dark November day, a small thick rain almost blotting out the very few objects ever to be discerned from the windows, was enough to make the sound of Lady Russell’s carriage exceedingly welcome; and yet, though desirous to be gone, she could not quit the Mansion House, or look an adieu to the Cottage, with its black, dripping and comfortless veranda, or even notice through the misty glasses the last humble tenements of the village, without a saddened heart.
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.