Related Clues:

• Empty — invalid
• Empty expanse
• Obsolete coin with nothing in it? Precisely
• Vacancy
• Word written across a bad check
• Partner of null
• Render worthless
• Nullified
• Like a redeemed coupon
• Gap, absence
• Blank, invalid
• A blank
• Empty; not valid
• Game not counted on the pools
• Not valid, empty space