Related Clues:

• 'Unbelievable!'
• "Wow!"
• More than cool
• 'Man!'
• 'Peachy!'
• 'Sounds swell!'
• "Swell!"
• Word of approval
• 'Terrif!'
• "I'm impressed!"
• "Nifty!"
• 'Pretty amazing!'
• "Amazing!"
• Impressive
• Tremendous