Related Clues:

• Inaccurate
• "No way!"
• "Don't think so"
• No, informally
• "That's a lie!"
• Rejoinder to 'Am, too!'
• Kid's retort
• ''Nope''
• 'Au contraire!'
• 'Not a chance'
• 'Naw'
• ''You're wrong!''
• ''Think again''
• 'Yup' opposite
• Au contraire