Definition of "unhealthiness"

[…] I possess an old house, Ferndean Manor, even more retired and hidden than this, where I could have lodged her safely enough, had not a scruple about the unhealthiness of the situation, in the heart of a wood, made my conscience recoil from the arrangement.

1847, Charlotte Brontë, chapter 27, in Jane Eyre‎

He looked elegant and vulnerable, his eyes edging away from contact and set into a face of exquisite unhealthiness.

1988, Edmund White, chapter 5, in The Beautiful Room is Empty, New York: Vintage International, published 1994