Related Clues:

• ''Ain't gonna happen!''
• Doubter's words
• Start of a speculative comment
• "Yeah, sure, sure"
• 'I ain't buyin' it!'
• "Oh, suuure"
• ''Sorry''
• "Ixnay!"
• "Not likely!"
• 'Ain't gonna happen!'
• Doubter's reply
• Casual negative
• ''Don't think so''
• ''Forget about it''
• Skeptic's challenge