Related Clues:

• 'Yeah, right'
• Positive
• 'You betcha!'
• Irrefutable
• Proven
• 'No problem!'
• 'Of course!'
• 'Let's do it!'
• Never-failing
• 'No sweat'
• 'Easy!'
• 'Oh, what the hell'
• Convinced
• 'Sure thing!'
• 'You bet'