the.com/musty
The smell of a basement that hasn't seen sunlight since disco died.
means Smelling stale, damp, and shut-in, like old books or rooms starved of fresh air.
from Likely a 1500s twist on moisty, the dank cousin of moist, then later flavored by must, the unfermented grape juice that turns funky if it lingers.
Actual culpritMold and bacteria emitting a compound called geosmin.
Same sourceGeosmin is why rain-on-dirt smells earthy.
Book funkOld paper releases vanilla-tinged musty chemicals as it decays.