Related Clues:

• "Nope!"
• 'Oh, yeah?'
• '___ fast!'
• ''Au contraire!''
• Two-timing
• 'Wrong!'
• Fictitious
• Not so
• Disloyal
• Fabricated
• 'You're lying!'
• "Baloney!"
• Inaccurate
• Skeptic's retort
• Trumped-up