Related Clues:

• ''Very doubtful!''
• 'Yeah, yeah'
• Skeptic's reply
• 'Uh-huh, sure'
• ''Not likely!''
• "I bet you don't know any!"
• "Yeah, whatever!"
• Dubious comment
• 'Not likely!'
• 'Yeah, as if!'
• "Yeah, as if!"
• ''Oh, sure''
• ''That'll be the day''
• 'Sure seems like it'
• "That's doubtful"