Akademik

musty

adj. (mustier, mustiest)
1 mouldy.
2 of a mouldy or stale smell or taste.
3 stale, antiquated (musty old books).
Derivatives:
mustily adv. mustiness n.
Etymology: perh. alt. f. moisty (MOIST) by assoc. with MUST(2)

Useful english dictionary. 2012.