Related Clues:

• Formal turndown
• Impossibly, informally
• ''When pigs fly!''
• Army retort
• 'Ain't gonna happen'
• Official denial
• Military denial
• Unequivocal refusal
• ''In your dreams!''
• Formal denial
• ''Forget it!''
• ''Not at all,'' vernacularly
• Corporal's denial
• Dismissive exclamation
• Strong denial