fus·ty /ˈfʌsti/

–adjective, -ti·er, -ti·est.
1. having a stale smell; moldy; musty: fusty rooms that were in need of a good airing.
2. old-fashioned or out-of-date, as architecture, furnishings, or the like: They still live in that fusty, gingerbread house.
3. stubbornly conservative or old-fashioned; fogyish.

1350–1400; ME fusti, equiv. to fust (n.) < OF: wine cask, tree trunk (< L fūstis stick, pole) + -y

—Related forms
fus·ti·ly, adverb
fus·ti·ness, noun

1. close, stuffy, oppressive; smelly, malodorous.

Source: Dictionary.com.

High windows, each of twelve violet panes, dimmed the afternoon sunlight; fusty magenta beams, slanting down across the room, warmed the dark oak wainscoting.

Source: Tales of the Dying Earth by Jack Vance.