Related Clues:

• At lunch, maybe
• Umpire's thumb signal
• Not occupied
• Empty like space
• Null and empty
• Containing nothing or not legally binding
• Empty space or vacuum
• Empty space or not legally binding
• Empty space or legally invalid
• Null and invalid
• Away, not at home
• Empty, vacant
• The outside
• Empty or vacant, like space
• Emptiness, empty space