Which preposition to use with unhealth

in Occurrences 1%

The mystery, whatever it was, that the brave, little, fat father was carrying off so bluffly, had clearly the morbid quality of unhealth in it, and Lanfear could not give himself freely to a young pleasure in the girl's dark beauty of eyes and hair, her pale, irregular, piquant face, her slender figure and flowing walk.

of Occurrences 1%

He stands out, both by his excellences and his defects, as the spokesman and ideal of all the unrest and unhealth of sensitive young men for many a year after.

Which preposition to use with  unhealth