If something is snuffy, it has a smell like dust or old things.
The word snuffy can make people think of old books, attics, or things that have been in one place for a long time.
Examples:
The old book has a snuffy smell.
The attic is snuffy and dark.
I don't like the snuffy smell in this room.
The snuffy room made me sneeze.
The snuffy smell was so strong, I could taste it!
The snuffy old blanket was my favorite.