Having lost tang or effervescence
Without freshness or appeal because of overuse
Old or musty
Dull and trite
The room smelled of stale air and mold.
The copper tray hit the bottom of the can with a loud clatter, spewing ashes into the stale office air.
It had the stale smell of an abandoned building.
Prince Vasili always spoke languidly, like an actor repeating a stale part.
I bet that will be as popular with the police as internal affairs or stale donuts.