Related Clues:

• Free from doubt
• 'That'd be fine'
• 'Why not?!'
• 'You got it'
• Doubtless
• Guaranteed to succeed
• 'No prob'
• "Without a doubt!"
• "Why not?"
• "Absolutely!"
• Absolutely certain
• "Of course!"
• Fully convinced
• "Fine with me"
• 'Certainly!'