adjective
musty
MUS-tee/ˈmʌsti/
Having a stale smell associated with dampness.
The musty blanket makes the woman recoil from its stale smell.

Etymology
Musty may be a variant of moisty, meaning “moist, damp,” which would connect the smell with dampness. This origin remains uncertain.
In context
Yeah. >> And it wasn't the beers. >> That's cool. That was just like how damp and musty it was and just like like Mitch said, just old and rustic
More examples
- A musty odor escapes when I open the closet.
- Towels get musty if you put them away damp.
- This room smells mustier when the windows stay closed.
Forms
musty · mustier · mustiest
mustiness noun — The quality of smelling stale and damp.
Similar words
- moldy
- Specifically suggests mold, rather than any stale, damp smell.
- stale
- Suggests lost freshness, without necessarily implying dampness or mold.