D defs.my
Entry 3 senses Webster, 1913

Musty

/mŭs'-tē/ · Mus·ty · IPA /ˈmʌsti/
01 a. Having the rank, pungent, offensive odor and taste which substances of organic origin acquire during warm, moist weather; foul or sour and …
  1. 1.
    Having the rank, pungent, offensive odor and taste which substances of organic origin acquire during warm, moist weather; foul or sour and fetid; moldy; as, musty corn; musty books.
  2. 2.
    Spoiled by age; rank; stale.
    “The proverb is somewhat musty.” Shak.
  3. 3.
    Dull; heavy; spiritless.