Related Clues:

• "Absolutely!"
• To everyone's surprise
• Absolutely certain
• "Of course!"
• Fully convinced
• "Fine with me"
• With low spirits
• 'Certainly!'
• 'Okey-doke'
• Verifiable
• "You bet!"
• "No problemo!"
• 'Works for me'
• Foolproof
• Doubt-free