Related Clues:

• Cancellation stamp
• Unfilled space
• Not good
• Sample-check word
• Not sound
• Tear up, so to speak
• Invalidated
• Word on a check
• Invalidate, as a check
• Null and ___
• Blank space
• Null and --
• "___ where prohibited"
• Not worth the paper it's printed on
• It's got nothing