musty
mus-ty
adjective
Having a stale, damp, and unpleasant smell, often from age or lack of fresh air.
"The old attic had a musty smell."
Thesaurus
Synonyms: malodorous, ill-smelling, stinky, fusty, frowsty, unpleasant-smelling, malodourous, mouldy, stale, moldy