The Collaborative International Dictionary
Fustiness \Fust"i*ness\, n. A fusty state or quality; moldiness; mustiness; an ill smell from moldiness.
Wiktionary
n. The quality of being fusty
Usage examples of "fustiness".
When he raised his head and squinted at me I could smell his decaying teeth along with the fustiness of his threadbare garb.
There was the smell of dust, hide, fustiness – of old, outworn things whose familiar, agreeable fug had somehow been strengthened as if through decoction, a pervasive but invisible cloud that swirled like cannon smoke above the delicate ruins.
It was this fustiness that had caused Koko's whiskers to twitch, Qwilleran assumed.
The furniture was an odd assortment, the wall frescoes were peeling and faded, and an old-fashioned fustiness suggested everything had been inadvertently left behind by the previous dynasty.