MUS'TY, a. [from must.] Moldy; sour; foul and fetid; as a musty cask; musty corn or straw; musty books.
1. State; spoiled by age. The proverb is somewhat musty.2. Having an ill flavor; as musty wine.3. Dull; heavy; spiritless. That he may not grow musty and unfit for conversation.