Noah Webster
Musty
MUS'TY, adjective [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.